Malicious PDF — malware analysis report

Static analysis result for SHA-256 5261068014c5ec50…

MALICIOUS

PDF

66.6 KB Created: 2020-11-11 17:33:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e657969fb736291cd976414b48085071 SHA-1: 7fcd06988982b3de661250144adf1183e7470b5f SHA-256: 5261068014c5ec500737d2d716c377b77fd1fc68de87f77e92baab5d05164552
214 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and ML classifiers. It contains a large number of embedded links, with critical heuristics indicating it's a redirector link to known malicious infrastructure and a PDF link farm. The primary malicious URLs identified are traffmen.ru and weebly.com, suggesting a phishing or malware distribution attempt.

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.
  • 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.
  • 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=cells+alive+cell+organelles+worksheet+answers In PDF document text
    • https://defonufagij.weebly.com/uploads/1/3/4/3/134360363/widona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f97111c4be3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f935d197c3e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375204/normal_5f9036918c830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393515/normal_5f9a403d98472.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/zoromexemuzid/subscription_revenue_model.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6d2bd6-bcf5-4f3d-9c6f-344a7d8957de/rixokoguje.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/37300440329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1117efb6-5e36-4c6c-9948-96b4b46bb638/partituras_de_aguinaldos_venezolanos.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/bose_sounddock_series_2_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd06ff5-e501-4133-bbb4-23a683f86ef5/85630572805.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/learn2serve_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd5b3cd-88a7-4508-9406-86be01d61a10/fixumotozibabop.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/23625950859.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/belogefewa.pdfIn PDF document text
    • https://s3.amazonaws.com/tefelaj/zupowumit.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_off0000c909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC909 5180 bytes
SHA-256: 158770bc6f6e36cc8dc4a2ea1363d035cb473a5bb9c7a0441cb6fe701d6115bc
font_01_sfnt_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 10164 bytes
SHA-256: 6ab1bfd01ef72b0200e289cd3ea92df383cefc12084c576fa1dc9197a1bdbd26

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