Malicious PDF — malware analysis report

Static analysis result for SHA-256 71db0043372edbf5…

MALICIOUS

PDF

90.6 KB Created: 2020-11-18 18:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9615b9818be975966126d44c765e2f0d SHA-1: 9750e4cfc77ece4489b6f2e535e6781fe0c4a1bd SHA-256: 71db0043372edbf5acc99deeda50014af99a494311abb1934577ce9836f32469
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://trafffe.ru/strik?utm_term=contrato+de+asociacion+civil+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392869/normal_5fb2e7896caa3.pdfIn PDF document text
    • https://narigepafosi.weebly.com/uploads/1/3/4/4/134471788/5853452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_5f9e6d954d724.pdfIn PDF document text
    • https://laguvibokabab.weebly.com/uploads/1/3/4/3/134383318/butilosofulagugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f9723d10422e.pdfIn PDF document text
    • https://kumupesefutevun.weebly.com/uploads/1/3/4/4/134463509/xetusokoremumaludi.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/6746eb955d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371023/normal_5f89eac7a2ed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_5f8dfadc8ea3e.pdfIn PDF document text
    • https://pefuxagofir.weebly.com/uploads/1/3/4/3/134359429/wevaxifuva-kurexok-vapogi.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/3ea94649-f588-4628-8c65-77787d8c9c7d/bodenotoroxazis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52766566-795a-47eb-8684-b79f3d6f4e77/jidugudusiriwurov.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/religetables_theme_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2624a0-eea5-461e-9797-acfab556ee50/leforevagalumuzepolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b945d4aa-8705-43f5-9bc1-0c46122dc4f6/polopanimow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6db75c0-2752-488a-9579-804af263914d/78917127421.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

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_off000125b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 5116 bytes
SHA-256: 146b120d3790ea2e3e56e3464dbc1d54cce8ae435ab66756439b640d30f64e66
font_01_sfnt_off0001372e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372E 11796 bytes
SHA-256: 2e9547188a0af5411c21218dc6474a333c0f4da93fad908bc3e036fe8efee25f

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