Malicious PDF — malware analysis report

Static analysis result for SHA-256 7633d8067bc1c82f…

MALICIOUS

PDF

78.7 KB Created: 2021-03-22 09:34:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2f465dfc7bee926a6d7d8b4b5cf16437 SHA-1: b44fa3e3987e0486c29367c8d2a3b3714280fea5 SHA-256: 7633d8067bc1c82f27c41dab23bf1bbd7200957299d76a30d22d82b0dfb78695
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jottigo.ru/123?utm_term=domain+3+expressions+and+equations+worksheet+answers PDF link annotation
    • http://zavodtriumf.com/legal_assistant_courses_in_canada5q804.pdfIn PDF document text
    • http://talakam.space/barred_tee_specification2l3wi.pdfIn PDF document text
    • http://luxuwum.mypressonline.com/90043042494.pdfIn PDF document text
    • http://levitajagukog.scienceontheweb.net/low_carb_snacks_for_diabetics.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/jfidii0/tecno_spot_forum.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/wjjGRhf/smash_bros_brawl_tier_list.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/94518519700.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/sigegiberilofugo.pdfIn PDF document text
    • http://creditscoretracking.info/the_secrets_of_freemasonry_elijahdzskm.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/ion_block_rocker_bluetooth_battery_replacement.pdfIn PDF document text
    • http://vawadofofasip.getenjoyment.net/types_of_biomes_in_india.pdfIn PDF document text
    • https://cdn.sqhk.co/luzorisu/b5jiDid/zaguforolaxebuxisubes.pdfIn PDF document text
    • https://cdn.sqhk.co/jewimebobi/ghvEhbV/embed_a_gif_in.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/software_assurance_microsoft.pdfIn PDF document text
    • http://wutugidejavazu.scienceontheweb.net/arm_cortex_m0cortex_m0.pdfIn PDF document text
    • http://nebatomefov.scienceontheweb.net/kambikuttan_malayalam_cartoon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bivojeda.atwebpages.com/14102743747.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_6ad55dd94d504c67bf28bb704dbee7a7.pdf?index=trueIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_027ac4a4d9694b8ebbe4d18b85a49070.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_f27f0ff9c70947948548e148843037bb.pdf?index=trueIn PDF document text
    • http://dugerem.atwebpages.com/ziwubafimatifal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 4244 bytes
SHA-256: 8c618fada78f20a478945e0f14272203bd047a5998252ee36568a8596ebe3e08
font_01_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 5680 bytes
SHA-256: 311366a56f7339b5476a48b4e2dded29d65c8e19c1ef2d3a9518b6e8ee4fe249
font_02_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 11100 bytes
SHA-256: 1d9f53b0ae8b55e2fab80f0e314688d11f15187a48ad1aa7afdd97da576b99e4

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