Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c05c51736c9af3…

MALICIOUS

PDF

68.3 KB Created: 2020-11-14 10:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d9818d994c58b2032c69c4b94a9c2169 SHA-1: 1c93f75846cb234819b0a043483e182699e2f6c6 SHA-256: f1c05c51736c9af39b06747212aff37d39881207976fe1ba27ee67a038f8ae39
236 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits multiple indicators of malicious activity, including a critical ML classification and ClamAV detection as a phishing trojan. The document's content, though heavily obfuscated, is designed to lure users into revealing recovery secrets or private keys, consistent with callback phishing or tech-support scam tactics. It also contains numerous external links, suggesting it may be part of a larger link farm or redirection scheme to deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/strik?utm_term=equifax+free+credit+report+identity+theft PDF link annotation
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/be47935eb28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_5fa357ebbc2ec.pdfIn PDF document text
    • https://zidajikivumab.weebly.com/uploads/1/3/4/6/134625594/jarelibibasare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5f8f501e79081.pdfIn PDF document text
    • https://jonipafatanepa.weebly.com/uploads/1/3/2/7/132741476/jufifu.pdfIn PDF document text
    • https://jugubiwujivivej.weebly.com/uploads/1/3/4/3/134352954/3347705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5f8bfd4208b74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_5f8c566b8be5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474445/normal_5fa655995d37f.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/4684087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_5fa93115b645b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5f920353c0204.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/xebareto/nidam.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9A 5288 bytes
SHA-256: 25260d88ea756f699c9583efce2241919804c7a41040914f3dd5ba1123bfafee
font_01_sfnt_off0000e1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A6 10168 bytes
SHA-256: 2f65523e495090bf9413b1e35dfda5d6db262aec0405ff7f7814356246f9e748

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