Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61234d4f1f9b112…

MALICIOUS

PDF

67.7 KB Created: 2021-01-08 10:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3ffad5c5005358b550c9ae55312ae1e0 SHA-1: 350d0b7ee4545026a2c2f1bcafa6ae4054e8c669 SHA-256: d61234d4f1f9b112dacdf58ce96d4edeb17bf446abc1ffaf2afb2ce7da2dd972
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=free+spider+solitaire+game+app+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459917/normal_5fa8da13946db.pdfIn PDF document text
    • https://juluvolalo.weebly.com/uploads/1/3/4/4/134435755/a76ccee7.pdfIn PDF document text
    • https://japilosibif.weebly.com/uploads/1/3/4/5/134578465/9858619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_5fab91d95ecb4.pdfIn PDF document text
    • https://zugixipenelir.weebly.com/uploads/1/3/4/5/134591811/5653027.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/wewigadote.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413121/normal_5ff67c4324e79.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/vonoba-ledokijofewug.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/ruzumeb/73427675471.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/angielski_czasy_zestawienie.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_off0000ca61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA61 5316 bytes
SHA-256: 5fcb0c75fbf02b65b7bf4e1ed294b007aad573ec52c4351ebec509c3bde08e75
font_01_sfnt_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 11024 bytes
SHA-256: deaa0222915bb7b26bf703ecc4ea75de0b3ba6e0293c9b137c751e8124ffd96b

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