Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbb4f897dcf2fcc…

MALICIOUS

PDF

58.8 KB Created: 2020-11-13 06:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b77006a1f5d0942cac50ee706dea422b SHA-1: 187cb8c0820d12ea20a143cd2b3257453b1efff6 SHA-256: 2dbb4f897dcf2fcc44aad1e1fc68d115adaec9c8cf833507fdbc7fd98e96934f
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 0.9996

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://traffset.ru/123?utm_term=ckz+origins+mod+apk+2.0.1 PDF link annotation
    • https://totobulamu.weebly.com/uploads/1/3/4/3/134310137/fc96b68a0f2.pdfIn PDF document text
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/tiriwegusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_5f9a54251a70a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5f8c9fc0a4e5d.pdfIn PDF document text
    • https://nozudasukexip.weebly.com/uploads/1/3/4/4/134441991/6322330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5fab965b833e1.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/8742011.pdfIn PDF document text
    • https://zazejisodixad.weebly.com/uploads/1/3/4/3/134359446/c9476997d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f96380d94933.pdfIn PDF document text
    • https://penepanixefi.weebly.com/uploads/1/3/4/3/134354239/7121114.pdfIn PDF document text
    • https://kimegawukinoge.weebly.com/uploads/1/3/4/6/134601577/fiwufutu.pdfIn PDF document text
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/jevetorovowumak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445534/normal_5fad9cbf0f3b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a4409c2-f9b3-4b08-97d5-9670bd445846/xirobuzufogifod.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_off0000aa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA66 5624 bytes
SHA-256: fbb9dfdbd0e99a5b9bccebb0def7d8d4f10eff3ff859df560ad7e44dc2b4f69e
font_01_sfnt_off0000bd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7D 9752 bytes
SHA-256: 216ed2eb40006ec27720a54970bcb790fde49b6f3edbe5adff8a469b0694f9fd

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