Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf59e9a035c6d4b6…

MALICIOUS

PDF

108.8 KB Created: 2020-12-03 21:12:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 033943b46dfd65695512255015ec7cf0 SHA-1: 156091d2a8579686b93030767d8a3bba0567a17e SHA-256: cf59e9a035c6d4b62b3fe13cbe7641c4be9491576f4b135f281f778abc10c86e
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-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://traffset.ru/123?utm_term=atlanta+to+costa+rica+flights+today PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475999/normal_5fbefd085ff5c.pdfIn PDF document text
    • https://zubawolovef.weebly.com/uploads/1/3/4/4/134481331/nujobu.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/5162387.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/kajusev.pdfIn PDF document text
    • https://nuwurabe.weebly.com/uploads/1/3/4/4/134477198/9955260.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7904132.pdfIn PDF document text
    • https://gexeperi.weebly.com/uploads/1/3/4/3/134348656/poselek-xirazaf-gatevux.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/pesupixo.pdfIn PDF document text
    • https://xasigorokukexef.weebly.com/uploads/1/3/4/8/134891024/dudupuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/25f733d5-081b-437c-b8d1-eafaa3bdd49f/73530829685.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf68679d79364840866bd6/1606379628037/13289271280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/446ee45b-26d1-48d0-9677-7cf35d3bdab2/kanizugugopiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f213183a-6d00-42ea-a33c-9425f5da58d4/semikuvi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf549b08845d0924814e54/1606374555708/backpage_mcallen_tx.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_off00015ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF2 5044 bytes
SHA-256: b00b565f65003c5d04befe3b681f668c554ad84942127634ac2951e5fbc5ca62
font_01_sfnt_off00017004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17004 12572 bytes
SHA-256: a28bb6c64fd820392d24ef01124aed29b7011295b72d62e5f6d4ca8dfdcd4a57
font_02_sfnt_off000197bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197BC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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