Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4dab17265d5ea1…

MALICIOUS

PDF

67.2 KB Created: 2020-12-15 03:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4408632c87da75ee91af4ba2a2c1a5c0 SHA-1: 92920d7287430b31e7582b74b02cf908152a2800 SHA-256: fa4dab17265d5ea1bfbd7193182d58e0502cb20a5a7d825a989677b42ca853ab
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 0.9997

Heuristics 6

  • 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 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://trafficel.ru/123?utm_term=shot+on+goal+hockey+definition PDF link annotation
    • https://nogegonimever.weebly.com/uploads/1/3/4/3/134340032/palosuxawadotawuwe.pdfIn PDF document text
    • https://vipefujalebir.weebly.com/uploads/1/3/4/7/134744486/5156827.pdfIn PDF document text
    • https://xovixonu.weebly.com/uploads/1/3/4/8/134896571/zozegege_lomujigibonefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_5f9257f38047a.pdfIn PDF document text
    • https://xemaxokiba.weebly.com/uploads/1/3/4/3/134350412/seretuxis_jazogatopuzuwot.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/bumux_rajovisafakol.pdfIn PDF document text
    • https://futixaxez.weebly.com/uploads/1/3/4/5/134516919/4a151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453741/normal_5fc25ded44e38.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/xemobubax.pdfIn PDF document text
    • https://luzenage.weebly.com/uploads/1/3/4/3/134317967/pibuviwekus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nowokil/80134419231.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce05bb90e5b06becb3f5d4/t/5fd6b89e5b1f6f7539e4686c/1607907487013/bhagavad_gita_songs_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAA 5276 bytes
SHA-256: 16e7e5f6e8a2d7bf830cdf63e091d9bb3c3a1d0ccec3190ed1499f7f0f2f9fef
font_01_sfnt_off0000cea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA8 2884 bytes
SHA-256: 1213b41b7171378c19388f350c6f9545fecce6a73c2540867fcbb71d0770df20
font_02_sfnt_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 10840 bytes
SHA-256: 92c29f56fd48b61c7407c4a008a65c5320b7fffcb9a1bdc6a573ba2ef1c709ef

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