Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b690183d88f6b0…

MALICIOUS

PDF

88.4 KB Created: 2021-05-03 00:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8de173bec819203f53dba777ffe39ad6 SHA-1: 4377ac21f6fa50a5fb1b91d1c8473b87485a4546 SHA-256: f6b690183d88f6b062d4c7384533ea466600a24f5a742290beeb435a52ca6e92
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to redirectors or disposable hosting, indicating a link farm designed to distribute traffic to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly suggest this malicious intent. While no scripts were extracted, the presence of numerous links and the ML classifier's high confidence score support the classification as a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=comma+review+worksheet+high+school In PDF document text
    • http://load-bcp.com/851848337517tbxx.pdfIn PDF document text
    • https://cdn.sqhk.co/besuduxikuvo/bjjIai7/xadux.pdfIn PDF document text
    • http://my-favshopc.online/quantifiers_grammar_worksheetkcqwl.pdfIn PDF document text
    • http://momentikshop.space/where_does_the_word_math_originate_fromx2izb.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/idPGOy7/fur_carpet_3d_model_free_download.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/how_to_refill_canon_inkjet_cartridge2j8lb.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/93781344353wc9v0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39b5c5e-b888-4685-95a7-3698a448577d/pathfinder_advanced_players_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aaee613-c6aa-4b3f-9422-3c34ea309e9a/21357626847.pdfIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_1b0904d3663e4b0582d551d544431445.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c52059d-2f32-468c-a98e-1e0b335eb132/93068471456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/889ad424-f490-437c-932b-0439cb6a2992/how_to_make_a_leather_knife_sheath_pattern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3309707a-cbe9-426c-8286-31adf07e95f5/4901465773.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_0c70bf6389ad415aa654c8da746e8a30.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_9c5882d383c641869c50e7c14f2da3c3.pdf?index=trueIn PDF document text
    • https://4f870d4f-701c-4ec6-bbb3-7277acc5528a.filesusr.com/ugd/fdcb8d_b651e28ec9f1403b8bb4e1c0657845b7.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_0bc205c8ea5349e6a29dc5c22cab7447.pdf?index=trueIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_f00b7fa8266245da97dc3aa7b2339c7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a233ce-fe1e-4e46-8f7d-88242abd4652/honda_4514_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24bee1be-ad61-4b93-a7bb-41cf6a53d9ab/zuvenavabaxajopobadeduk.pdfIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_10d75733ad644f54baf3afa53086f4dc.pdf?index=trueIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_0b357a05f3264db6846df73c97bef9c7.pdf?index=trueIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_a21f5ba7faa84839b331b9624086dfef.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_a50397d1d32e40dda84ef3e31fad7995.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e88fc0-b737-41a1-a95e-03d4ca91bbba/how_to_prevent_high_blood_pressure_while_pregnant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f529ac9-47d9-496f-b58a-9fe214f68f01/que_se_necesita_para_sacar_una_tarjeta_de_credito_santander.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 5336 bytes
SHA-256: 5bf2bf66b375b4a2d28d51bbd1140a6a491bb6f9add8b3f1d102d79b1b03810b
font_01_sfnt_off00012df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF9 11192 bytes
SHA-256: fb23ae50b1a9d51db55028461f655bac8f34091175161462fc6e9a784dd37758

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