Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15fe9febc2a69d7…

MALICIOUS

PDF

69.8 KB Created: 2020-11-13 23:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: eb7e897dc354e13435b2997fec7cbc70 SHA-1: 19ab5c26c2cf80760bd78199de386ced0f7be8ee SHA-256: d15fe9febc2a69d716d42b7274a8b94485123f8f1e729db054fe68fb7a427aa3
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure and 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 0.9995

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/aws?utm_term=google+chrome+pc+setup+free PDF link annotation
    • https://dajapofijakaf.weebly.com/uploads/1/3/4/2/134266914/tudelunagovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5f99132df2e53.pdfIn PDF document text
    • https://nilijinaxobizag.weebly.com/uploads/1/3/4/3/134356504/sasapevomipukar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_5f9d2b094ff03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_5fa602ad66af8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zetare/98960172237.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/administering_medication.pdfIn PDF document text
    • https://s3.amazonaws.com/vasagesorajirem/12212670921.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/nutrient_bioavailability.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/73268122317.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78B 4980 bytes
SHA-256: 6adc27ab0f4d9d2ec2d2d06af44a281dc8b0e94ad1f5249d6ee3f6f59b2a6abb
font_01_sfnt_off0000d88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 10440 bytes
SHA-256: da57701c579f79e275ced7d420717350fb814a0e33aa05acb4e28c8488410133
font_02_sfnt_off0000fc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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