Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1bc09d142e3fa4…

MALICIOUS

PDF

77.7 KB Created: 2021-03-15 07:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4ebd8565869125a4e43d7b26536da2bb SHA-1: 281011094275885891a90da292db546a75f997a6 SHA-256: 4a1bc09d142e3fa458a59e01935f9f3fbf9488789fa815726fd43bc371c430d0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and also detected by ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded URLs likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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.
  • 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://gimoguvi.ru/wix?keyword=reduction+in+purchasing+across+the+board PDF link annotation
    • http://totalcreditreport.info/15376795371klpkl.pdfIn PDF document text
    • https://pitazifuriza.weebly.com/uploads/1/3/0/9/130969431/a49a0792f8faad.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/g9gjtzs/female_bearded_dragon_for_sale_near_me.pdfIn PDF document text
    • http://romeital.space/el_pobrecito_translation_english4fa78.pdfIn PDF document text
    • https://nidedijuba.weebly.com/uploads/1/3/0/8/130814831/poluzanil.pdfIn PDF document text
    • http://price-list.moscow/4399911598601ri4.pdfIn PDF document text
    • http://prizyivnik.ru/dawevewetarzec60.pdfIn PDF document text
    • https://bekefipupo.weebly.com/uploads/1/3/4/0/134096026/kapefow-mojebubix.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/jahepW0/papanebuzoga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xenavuxa/bixby_apk_for_s6_edge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd29b9f-da2b-457e-a560-771f80022190/hp_laserjet_p3015_driver_for_windows_7_32_bit_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41bbf162-16cc-479f-8dbc-2ccef5d48f86/bernat_premium_yarn_color_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7629ce1d-036b-4081-9b2e-f47c0876c524/69638839622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5301869-b18f-4d88-aa94-2d9612298e34/us_history_timeline_from_1600_to_1800.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/aparatos_de_ortodoncia_para_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/abortus_usu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f9b475-70c7-463c-a971-ef6d7a083e9b/pedagogy_of_the_oppressed_citation_1970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e6a463-a87d-4076-9b9a-2f3fc23440ea/christmas_math_worksheets_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/ebcdic_encoding_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a73b124-5225-4cf5-b9de-ab187e74f656/are_hp_and_canon_ink_cartridges_interchangeable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e46630-acf8-4459-a8ed-3317c14a650f/craftsman_18_chainsaw_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c13aa31-5a61-4d12-abc0-b1c747b1dcbe/over_the_rainbow_ukulele_chords_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f4d02d-5da6-4fe7-9696-833f17cda46f/ralopolupenekenubiwomumiw.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/hemoglobin_structure_and_function.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_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 5332 bytes
SHA-256: b5e8451561a059401e8fddeecf83fd91fafd6a28f079de67888cd9465d8b7ac4
font_01_sfnt_off0000f584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 10416 bytes
SHA-256: a6b4b840c36911437f102b34a4e00b78ab75115861311636c34248e0f7b32bd8
font_02_sfnt_off0001190d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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