Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cb1d67f809918d…

MALICIOUS

PDF

81.1 KB Created: 2020-12-15 17:46:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 46f2c023bf00ae8625e78ee85fb25c55 SHA-1: ef953f4dcf1ea22f7dfcd14edda6a3191d2146f0 SHA-256: 51cb1d67f809918d8252e73caf81f46e6778a75d23ea3eb81e400cabe3e42ee2
176 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDFs, suggesting a link farm or content spamming operation. One prominent URL, https://trafffi.ru/123?utm_term=harley+davidson+with+sidecar+for+sale+in+texas, appears to be a lure for phishing or malware distribution. The presence of a callback lure heuristic further supports a phishing or scam-related attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafffi.ru/123?utm_term=harley+davidson+with+sidecar+for+sale+in+texas PDF link annotation
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/dc2e21d1de9df.pdfIn PDF document text
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/letutinu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_5f8d0580abfce.pdfIn PDF document text
    • https://pigikitukapu.weebly.com/uploads/1/3/4/6/134693564/3507869.pdfIn PDF document text
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/10ef1834345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481673/normal_5fd1e3827ed66.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/vavebufevodutob/broodmother_lysrix_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c90d27a-9ca9-4795-a101-5c9d0c5f52e8/denepujafexipibo.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/pabekekeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0bf2fd7-e227-4b07-9710-cf206ce6fc65/indiana_plagiarism_test_answers_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5008c83-01ea-4df3-8ebd-f09117ac6635/59626313512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948c5959-f09b-47aa-a836-8e85ea0a33fd/52030689312.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/42622373681.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 5392 bytes
SHA-256: 938851401c0bcbfd902187aaf365d984c98d64dd9778bb61d33ddbba002706e0
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 11636 bytes
SHA-256: ad981937a1b0a41d5e67145541165dd734148268250f11ab5f679d26dae2b3b9
font_02_sfnt_off00012029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140

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