Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bbd9026a04eab1…

MALICIOUS

PDF

74.2 KB Created: 2020-12-10 14:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ed608c57323b5a4f4d153a62582f20fa SHA-1: e647839eebe566ce5499189da88cdced9a0d5605 SHA-256: 71bbd9026a04eab1b6fbc3371f85aafd6948e70fc867658961aed39a1e50ab88
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a malicious redirector link to 'traffmen.ru' which is associated with phishing. Heuristics indicate a callback phishing lure, suggesting the document is designed to trick users into calling a fraudulent number. The ML classifier strongly flags this PDF as malicious, and ClamAV identifies it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=china+visa+form+toronto In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5fa5ba1d298d5.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/8743681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_5fb4d3071a4b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5402c6609fd0ee7ae1977/t/5fd07a23fc93c51d16df9705/1607498276215/boxiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84530b73-6a14-44bd-ab65-138de1e13b98/wegelakuzofezawufeje.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f319ab79f442f229e2d8/t/5fc16e34fa04221c7155ae21/1606512180583/92987991151.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3805b3dfdd95b60e588d7/t/5fd13891f3bd5377ad97da24/1607547026468/75736681665.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/certificate_of_conformity_uk_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/xabimarigaradefamimo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6e6aa54d69c5962322ebc/t/5fc7b34e788a962b7c38a082/1606923090982/citrus_fruit_harvest_times.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0012c12facd59cea80d2a/t/5fc2a11a7acac6192a169622/1606590750179/gofibetef.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_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 4940 bytes
SHA-256: 43e28cfdbf8efc87e2c3f342531f779a46a98a23016c743a12ee25d90003e71a
font_01_sfnt_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 11000 bytes
SHA-256: 890b0ad5e0e6dbc0c1821442487eaa9a0a3a7e4f018dfb4cf1e38ec50c6e24e7

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