Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1b3e3cc1074f8f…

MALICIOUS

PDF

63.4 KB Created: 2020-12-22 08:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0115090dc570176da81d3e58ab6f757f SHA-1: 4c6a80faefae98408e8454dda1f95e586ac36ac7 SHA-256: 9c1b3e3cc1074f8f13d78a66d89a76a5b9ddceac1694090da959a43414bc8d27
246 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which are part of a link farm designed to appear as legitimate content. The primary URL suggests a phishing lure related to a compromised PayPal account. The presence of a password-protected archive lure heuristic indicates an attempt to bypass security scanning by encrypting a payload. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffe.ru/wb?keyword=paypal%20account%20hacked%20and%20phone%20number%20changed PDF link annotation
    • https://bibatuzasofobi.weebly.com/uploads/1/3/4/8/134879938/gewetise-rikakodi-jemulukafevug.pdfIn PDF document text
    • https://gokododilu.weebly.com/uploads/1/3/4/5/134578034/4944879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f9b34c29a7c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_5fbbaf9bc4451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461773/normal_5fb61211e8e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_5f990752e88e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490746/normal_5fb8acab54bf8.pdfIn PDF document text
    • https://fikenetefi.weebly.com/uploads/1/3/4/7/134771518/87176d426f5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370288/normal_5fc4c8e2ee933.pdfIn PDF document text
    • https://xipijixulureju.weebly.com/uploads/1/3/4/3/134377958/7783487.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/bofake/gexabidajudidek.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe13b7d3b87d62887730803/t/5fe1619d23faae37ab20bf17/1608606113687/adventure_game_android_best.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc37324df132613bbcddee0/t/5fc464decb3e0f5771dc8361/1606706399722/here_be_pigs_divinity_2.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_off0000baa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA3 5616 bytes
SHA-256: 512acf4a28ae490b7b3bca2662c09a620ca11fd5b81d446f0e8dffea20b03601
font_01_sfnt_off0000cd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD95 10184 bytes
SHA-256: f43f5e028ff23a8c39ff86ad7656942f576d0960d7868da1b931fdbd3d31192b

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