Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c74519eea178d1…

MALICIOUS

PDF

67.7 KB Created: 2020-11-10 02:29:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9f1828f01f25d8add8a7ad814ba96900 SHA-1: 252ca1f29212fcc946879c247e46159c516d8f3a SHA-256: b0c74519eea178d15e78af1a71d4eb37fca80e8e85f14fae1cd5dbb0589c79b6
176 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. It uses a callback-phone (TOAD) lure. 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffnew.ru/123?keyword=register+of+deeds+guilford+county+nc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5f8c815b315b7.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/nodelorofe_ritizolomireku_gavefava_jafilovolideke.pdfIn PDF document text
    • https://tidoxanarapora.weebly.com/uploads/1/3/2/7/132710787/5365892.pdfIn PDF document text
    • https://weduxuvup.weebly.com/uploads/1/3/4/3/134308116/5996403.pdfIn PDF document text
    • https://ruxuxosiforedop.weebly.com/uploads/1/3/4/4/134491380/gewido_bejezopazodove_defaravug.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/2eec82f9a7e30.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/rubozifa.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/gajakelegeza/84897994593.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/stanley_fatmax_spotlight_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/cuanto_cuesta_renovar_licencia_realtor_miami_fl.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/falatatejokase.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_off0000ca3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3B 5088 bytes
SHA-256: eb235338d8875f82aada66ebc5ed6201f89de97d91f71422028d3a06b08a1d79
font_01_sfnt_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 11200 bytes
SHA-256: 9c893cd177c1274d88851fd1ccd42778d3aecb49b684073a650020c85dcbbbdb

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