Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb4c926b690c24a…

MALICIOUS

PDF

75.3 KB Created: 2021-01-07 20:33:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d406123d38e2fee68859425a485c6ea7 SHA-1: 9ed1cfe00799c3f0607ef82755283f888b677821 SHA-256: 4cb4c926b690c24aca3222cb336a976d3b063e87a14de88d8c568e1299213a24
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains like weebly.com, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffine.ru/aws?utm_term=4k+ultra+hd+android+tv+box+reviews PDF link annotation
    • https://bamususifilozok.weebly.com/uploads/1/3/1/3/131383301/vuwizaxeretopof.pdfIn PDF document text
    • https://zenerabu.weebly.com/uploads/1/3/4/8/134870876/tuvubosevapexopo.pdfIn PDF document text
    • https://powumebaporisav.weebly.com/uploads/1/3/4/8/134891471/xafutudinodege-zumixupe.pdfIn PDF document text
    • https://renugukid.weebly.com/uploads/1/3/0/9/130969315/358cdb7cc.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/k7XhcxM/88680289413.pdfIn PDF document text
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/sipajejojagox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5f888c176a253.pdfIn PDF document text
    • https://lomedalepa.weebly.com/uploads/1/3/4/4/134438906/1251193.pdfIn PDF document text
    • https://kitarenabokuvum.weebly.com/uploads/1/3/4/4/134479912/lesimubozabukifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_5fb5b357c5027.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/2042605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451574/normal_5fa0705155f3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_5fad81aa312b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 5328 bytes
SHA-256: c4599bf05f95196db2bbb9d1dd2bd3a950b127421e5797e10f7a9811be095403
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 10788 bytes
SHA-256: f227955fbc3e7abe60a8e135e106cdaa6386b5ded88b11e00d207b5dc9743a72

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