Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c83cbcb9f305b1…

MALICIOUS

PDF

75.6 KB Created: 2020-12-21 21:16:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1250e014f49961269b772d9491548299 SHA-1: 3ce3c42d0d65889bcca283d6f42ec2be60454ee4 SHA-256: 51c83cbcb9f305b1cf3d065de32bd0470163e7c1c6428f8d36153c490c319662
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it contains a link to known malicious redirector infrastructure and presents a callback phishing lure, prompting the user to contact a number for urgent matters. While no scripts were directly extracted, the PDF structure and malicious link suggest an attempt to redirect the user to a phishing site or initiate a fraudulent phone interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=national+corvette+museum+schedule In PDF document text
    • https://cdn-cms.f-static.net/uploads/4449987/normal_5fbd8f11b1077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_5fbc7a342bb33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471096/normal_5fbad31f39946.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/luwuko_pufug.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/458cd649.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a16180dd-bb27-4e6a-97d1-25d352f4aa33/sanelovobifo.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/medicine_bottle_label_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3855874-4f84-4e16-bc64-21fb5cfe3f85/ridurikunolome.pdfIn PDF document text
    • https://s3.amazonaws.com/vasagesorajirem/download_game_guardian_hack_tool_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7664a09-6e89-4aef-89c3-4d39a7595f55/2775552030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/458e419f-b94c-41f2-bc90-5d3cc44e287f/65668922523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ab1bc7-adf1-4dd0-a27a-b919aada8bf4/nikonotilo.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_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 5208 bytes
SHA-256: 30577fad8637edbf7116f45bde5e8461171de0ef8e16f185236b1175e65e7d3b
font_01_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 11208 bytes
SHA-256: 98514d353421f4e13f44751112861d23ab29f6dec10851eb77c8d8f934adf4a9

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