Malicious PDF — malware analysis report

Static analysis result for SHA-256 6548ecde48755c3d…

MALICIOUS

PDF

70.4 KB Created: 2021-01-04 15:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 111b02d768a4ea094b5c817d6b9acaed SHA-1: 7eb8eae5d10ea1c212281bc832bd5d1438c739da SHA-256: 6548ecde48755c3d032527e9d0d8b8ef1f4f1b49f5a33e5febd422727246237a
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and are likely part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/123?utm_term=cooks+essentials+pressure+cooker+manual+99740 In PDF document text
    • https://fisegumatiwal.weebly.com/uploads/1/3/4/7/134722042/1217880.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421049/normal_5fc47e70e5ce5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449616/normal_5fd3cce27805f.pdfIn PDF document text
    • https://mivoxoxez.weebly.com/uploads/1/3/4/3/134340481/vumasipif.pdfIn PDF document text
    • https://cdn.sqhk.co/fumazuri/dEgf1iq/lelokolajuruduvuxoj.pdfIn PDF document text
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/3894750bb98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_5f95b3037b099.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/68351bfc-31d9-4c67-84cf-bf4d5d0aa7cd/sports_interview_questions_for_football_players.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/golongan_anti_jamur.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/antique_clock_value_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8666828-a252-4f84-924d-ede5f66a8c2d/what_does_a_hard_flexibility_wand_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02038efc-0d13-4bb2-8998-112d24422c35/best_movie_download_apk_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f1e127-2471-41f4-9c13-22d36c478676/teredo.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_off0000d3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 5512 bytes
SHA-256: f5ded8fd234a13225d9ad52cef7e51bef27d43d25432d04bb6a755163d8d8d49
font_01_sfnt_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 11364 bytes
SHA-256: 02848264f823b629b081f22210da32a3db912935073d9a178175a6fc8b5318a3

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