Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89ac9114fef4519…

MALICIOUS

PDF

69.8 KB Created: 2021-03-20 13:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 10849756256174d0ef803ddd0697c122 SHA-1: df7c65ba2f615f9cafc8ca326a9072048ac98143 SHA-256: a89ac9114fef45197f00a56eb8cb6834d5d83e6f65ce481fce09eaa4666c5d15
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were extracted, the presence of external URIs and the link farm heuristic point towards an attack pattern involving user redirection to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=brandywine+spca+facebook PDF link annotation
    • http://my-favshopf.online/tamil_news_paper_formatx58eo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414498/normal_6038d8804402c.pdfIn PDF document text
    • https://cdn.sqhk.co/puvivefujef/Ahh9kQo/29946451662.pdfIn PDF document text
    • http://sdfafq.info/whirlpool_washing_machine_repair_manual2p3es.pdfIn PDF document text
    • http://qlemelest.online/888314063608sf2p.pdfIn PDF document text
    • http://fb-ig-violation.com/flysky_fs-16_firmware_updatexvt9v.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/ignxThf/anime_d._note_stickers_for_whatsapp_iphone.pdfIn PDF document text
    • http://7lessons.space/98947639515hsqfd.pdfIn PDF document text
    • http://betmoy57.com/xipuw228xk.pdfIn PDF document text
    • http://aydym.club/56800224793wzzm2.pdfIn PDF document text
    • http://supportcopyright.net/fidic_contracts_guide_1st_edition_20204o3v5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470832/normal_604acfb93fa1a.pdfIn PDF document text
    • http://show-visitor.xyz/dark_souls_3_bosses_tier_listc5wuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446394/normal_5fec6b64e3f90.pdfIn PDF document text
    • http://liketime.online/66701566910fzjqg.pdfIn PDF document text
    • https://cdn.sqhk.co/sogozoxu/idu3Hjh/kizomafakozujasi.pdfIn PDF document text
    • https://cdn.sqhk.co/visipapafef/E5Whhgh/44312269107.pdfIn PDF document text
    • http://trells.space/xidufozadivexovigev6tqtt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496225/normal_6055800439c2e.pdfIn PDF document text
    • http://tamowigaxijatot.66ghz.com/gv2me08_schneider_datasheet.pdfIn PDF document text
    • https://cdn.sqhk.co/miloniwuwave/jjtf6ja/repair_large_hole_in_hardwood_floor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fabavokawibawo.epizy.com/tibiv.pdfIn PDF document text
    • http://xifuwotemukoxax.rf.gd/nesinov.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_off0000d243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD243 5564 bytes
SHA-256: c9cc9766aef7b1590edc45bd3423ac342700f071f2c4bce95262d8c1d0113f5f
font_01_sfnt_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 10620 bytes
SHA-256: f294a14a934714a3cdd51f5984548e507b993df17c094f6b3b8c23bc43f67ed8

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