Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5f1eba83cf4733…

MALICIOUS

PDF

87.1 KB Created: 2020-12-04 06:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c6e2c9eac222e6228e223a4a90576db4 SHA-1: d0b3fd31acf4c1fff2b43282a01a77778bf6cf45 SHA-256: 4b5f1eba83cf4733f85e21e97b6b9ceaee4c67ab98d2cec6400c02b145eb9aa6
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 0.9997

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://traffset.ru/strik?utm_term=rs422+vs+rs485+full+duplex PDF link annotation
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/578063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365662/normal_5fc3bd4c81b8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465125/normal_5fc4eed36450d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378149/normal_5fb7af865b085.pdfIn PDF document text
    • https://vasedowazapen.weebly.com/uploads/1/3/4/3/134320052/9719347.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451231/normal_5fc6a1fc76919.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/kunigu.pdfIn PDF document text
    • https://dawerofe.weebly.com/uploads/1/3/4/3/134361643/telelon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f8a0ad302fc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0879da3bf4b14aba759f2/t/5fc12c49bc819f1cf402408a/1606495305993/twin_furies_solo_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/appbounty_hack_bot_apk.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_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 5500 bytes
SHA-256: bdca0d74b3d6fecd7c326597190eca102a41ba99f737eac98b75d9385a854805
font_01_sfnt_off00012630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12630 12172 bytes
SHA-256: 7b29457d9b45e1ca515615ccb1a15d724f716fb50a547da2b307705af63314a5

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