Malicious PDF — malware analysis report

Static analysis result for SHA-256 9468a3a946a8049d…

MALICIOUS

PDF

70.7 KB Created: 2021-02-24 02:53:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 37cd6311cb5206751d3f872eaa23ba2c SHA-1: dc71e2bae2a933e79b1fefa94ea97baf1695f020 SHA-256: 9468a3a946a8049dd73a4c0a90fad3ced6646cb29b867c5580fc6b6f012ded08
206 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a callback lure heuristic further supports a phishing or scam pretext. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites or initiate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://jacksth.ru/strik?utm_term=david%2527s+bridal+preservation+kit+coupon PDF link annotation
    • https://dapoxegimore.weebly.com/uploads/1/3/0/9/130969679/dovazi.pdfIn PDF document text
    • http://lg-copyrightforms.com/73245117117yjdtp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501361/normal_5ff4c735774ba.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/GLg4ibS/tijufari.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/qhgihgh/td_auto_bank_login.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451365/normal_60084a9a3f425.pdfIn PDF document text
    • https://tirigimufaregi.weebly.com/uploads/1/3/4/4/134464067/dc7cd3dc478be.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/OPghhiH/loxigevaf.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/d5e0d01743d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_600e13a8a9c26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_6027ac44233b1.pdfIn PDF document text
    • https://pesowisigafu.weebly.com/uploads/1/3/0/7/130739627/vimimuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412778/normal_601b5461d36a8.pdfIn PDF document text
    • https://nujirami.weebly.com/uploads/1/3/1/3/131384028/rufudirar_jumekozumij_daruze.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/fiaIohc/25563760163.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 5364 bytes
SHA-256: c7289a71388555ee48bfdbf1ea884cdbfd0517a1a1ea314cec2dfdf85c9045eb
font_01_sfnt_off0000e60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 11712 bytes
SHA-256: 41fdb58eddf696cf9daa3fdcee9a9ed05e232c7401b23d55016a72d6e1cb897e

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