Malicious PDF — malware analysis report

Static analysis result for SHA-256 871583da0df842d2…

MALICIOUS

PDF

67.0 KB Created: 2021-02-17 20:12:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ebe1225da679027d3de8a51932527b74 SHA-1: c9aa34332bce308910370593474c0b8ab0861a76 SHA-256: 871583da0df842d2e1232da653c41a564c4fae20df2ab492dbe4ddd39b736cf1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://seumenha.ru/wix?keyword=library+of+special+functions+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474222/normal_5fec37c0c4882.pdfIn PDF document text
    • https://cdn.sqhk.co/jomenuluz/7lSWiT0/draw_climber_game_y8.pdfIn PDF document text
    • http://eroganoficial.site/calculus_for_the_life_sciences_greenwell_2nd_editionfvszf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476446/normal_5fe89a91751f1.pdfIn PDF document text
    • http://hdsamara.ru/judgement_on_credit_report_how_longzy4n2.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/WhpNjat/haircuts_for_men_2020.pdfIn PDF document text
    • http://fruit-citrus.space/dell_r740xd_spec_sheetd372r.pdfIn PDF document text
    • http://bio-ita.fun/3540986627f6w32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366639/normal_5ff980e19bdcc.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/hJmgcif/46476555293.pdfIn PDF document text
    • http://sethel.xyz/jivuduzeginaklvqs.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/what_is_the_theme_in_the_pit_and_the_pendulumgwd79.pdfIn PDF document text
    • http://yandex-delivery.cc/77253925629yzr82.pdfIn PDF document text
    • http://help-nanny.site/30747008334w9o2i.pdfIn PDF document text
    • http://mivetys.xyz/simple_angularjs_website_template_free3zrhg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_60268a4d4d868.pdfIn PDF document text
    • https://cdn.sqhk.co/wamedexipun/D9jgdid/3649481478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501029/normal_6020a33993566.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383445/normal_5fc73801b91eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E8 5444 bytes
SHA-256: 455084c3d8765fca017e306667584f0005bb3c59e806fced143fc7992f31b806
font_01_sfnt_off0000d982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 10732 bytes
SHA-256: 619aba84515e1b8237929c6d5a3e38a3fed2495a04527b60d27e455520ba2a54

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