Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a407700f0101db…

MALICIOUS

PDF

71.7 KB Created: 2021-02-22 06:14:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57100b1cc1a62ba407d5efcbe110b8f7 SHA-1: 597975b818a87b2784ac4179938996d0e495c707 SHA-256: c6a407700f0101dbdd93c1dbb65a3ea57a29840faa2f7be875a0d866b975802f
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-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://jacksth.ru/strik?utm_term=1734-aentr+default+password PDF link annotation
    • https://cdn.sqhk.co/suwezuzifu/jdihrgj/carriage_kia_in_gainesville.pdfIn PDF document text
    • http://apelsins.space/xilija9o89f.pdfIn PDF document text
    • http://seomagnat1.online/email_blast_design_templatestauyv.pdfIn PDF document text
    • http://getliterate.online/koxotemitesegegopakimom8omi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368979/normal_5fcd271a67692.pdfIn PDF document text
    • https://cdn.sqhk.co/burajugi/6gfV1hb/live_wallpapers_for_samsung_s10_plus.pdfIn PDF document text
    • http://mybiol.site/copyediting_style_sheet_examplesdew5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381104/normal_5fdeb826613d0.pdfIn PDF document text
    • http://pushbiz.fun/16597969724w2hrw.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/xiberemob.pdfIn PDF document text
    • https://tiwamufeg.weebly.com/uploads/1/3/1/8/131871705/nudelikafitugawure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413368/normal_601e1e1490af6.pdfIn PDF document text
    • https://bonuwokepav.weebly.com/uploads/1/3/4/5/134592975/fadipugozileja.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/YiIgiij/18807949334.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/pabazenojedukizex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_6018308a7479e.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_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 5284 bytes
SHA-256: 5dc6e20914624bf516eba20ea5b4f8ab608d2bc4e0568ae4749b3e3d6e4a3ebd
font_01_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 10424 bytes
SHA-256: b8d5048855b0ebf16472a2b1938c0cf111a52f4810d5010f768954b5b9275c12
font_02_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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