Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef96283eebedf02a…

MALICIOUS

PDF

73.7 KB Created: 2021-02-27 21:09:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 06be7a1d017ed5ee805050386264c54e SHA-1: 0e92761b4897c3b6fb970ef887e999e100940634 SHA-256: ef96283eebedf02aadd73f26626e6c8f144e3ac8e5239903f4177122da9e022a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this behavior. The ClamAV detection and ML classifier further support the malicious nature of the file, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used to deliver further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=que+significa+la+linealizacion PDF link annotation
    • https://cdn.sqhk.co/bavomizobe/ijjj8gf/8269598221.pdfIn PDF document text
    • http://citruss.space/42462241749gjage.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/jcgdhd6/givefuxoxamuve.pdfIn PDF document text
    • https://cdn.sqhk.co/pomijatan/g0IiejG/army_clash_of_clans_game_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/wovenebi/hdUiggg/poxovod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412408/normal_602c9a925a8fb.pdfIn PDF document text
    • https://kojovade.weebly.com/uploads/1/3/4/6/134681743/remineke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486061/normal_5feb15585a8c4.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/cjgADij/90154407234.pdfIn PDF document text
    • https://mitigovoponezix.weebly.com/uploads/1/3/4/3/134375948/6810036.pdfIn PDF document text
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/wibako_gikasazu_fatejezule_sofufiviz.pdfIn PDF document text
    • https://tilavulam.weebly.com/uploads/1/3/0/7/130739056/602855.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449788/normal_5fdfd899dfb73.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/hGJJTmZ/kasakola.pdfIn PDF document text
    • http://kujudunoberij.22web.org/gozatamifitizowobamuginot.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/hidQQfY/crafting_and_building_pc_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_5fd0df9514979.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/f20b5244758.pdfIn PDF document text
    • http://watulexop.iblogger.org/vcop_game_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://letupekego.rf.gd/border_patrol_uniform_regulations.pdfIn PDF document text
    • http://rezekov.rf.gd/68010596503.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_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 5064 bytes
SHA-256: a453ef7f44db59645b94c3cb971538ea3024ecc4f9b402ac5ed0925c74a33beb
font_01_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 11964 bytes
SHA-256: 3200dac0bacbcda41af390ab5bea4ec4e4d8fe896a75327af1f2db029e6b55f0

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