Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dc0f436f9df365…

MALICIOUS

PDF

68.5 KB Created: 2021-02-14 11:37:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b841ef1b5f581f8871ffd3a225a3fead SHA-1: 0f2cc718d55d96ca05de018f6e743e0f55b5d482 SHA-256: 43dc0f436f9df3657892da34d75070431f7f7ca04d52f04fca182886e2b194ad
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://jacksth.ru/aws?utm_term=wordscapes+answers+1243 PDF link annotation
    • https://cdn.sqhk.co/mivijigonof/idR2hfE/27588072828.pdfIn PDF document text
    • http://goodsun.fun/zomobisipozinozj94t7.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/yXNIwhg/night_of_the_full_moon_mystery_man.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/gexghDM/9969801301.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443814/normal_5fcc93b0e4029.pdfIn PDF document text
    • http://goproits.com/laramiwivezh81i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467286/normal_5fcd5fa800702.pdfIn PDF document text
    • http://8gusevshop.space/matematicas_5_primaria_sm_solucionar4yqw3.pdfIn PDF document text
    • https://cdn.sqhk.co/guregame/Glclidv/2_player_murder_mystery_game_ps4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_5fd2364531df8.pdfIn PDF document text
    • http://elinekici.online/model_boat_out_of_cardboard_templates6ykz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393019/normal_5fec2b96ca046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471995/normal_5ff4a5273d229.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/FZjhmpg/wowowufewipiti.pdfIn PDF document text
    • http://wiinorama.fun/voxerolizuaftnh.pdfIn PDF document text
    • http://runmasten.online/hyrule_warriors_switch_new_charactersga6ns.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
    • 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_off0000c22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22B 5236 bytes
SHA-256: 51c850ee68e5d999355f07c1f2e91e2657ac4ed2f25f1b67e98eef336fccdf31
font_01_sfnt_off0000d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 10232 bytes
SHA-256: 5ca15349c02255ba7fa0975b033296b2f9c0771afbe5a0e4537b072b8d1e3838
font_02_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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