Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e16089d10684249…

MALICIOUS

PDF

77.8 KB Created: 2021-01-07 03:21:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7551e7f6b7bc21567dc0a66a2ad458ba SHA-1: 773ac35f9ff844662dd086f268c7a6d3cf0e6bf9 SHA-256: 3e16089d1068424955dcb6d22646432e80f2e76a075e440f68ed20acceb8680f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to distribute traffic to various potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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.
  • 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.
  • 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://traffset.ru/123?utm_term=fieldpiece+sman460+reset PDF link annotation
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/1328725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416128/normal_5fc0915fbfdd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5f88bb3a8584d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373508/normal_5ff11c010db21.pdfIn PDF document text
    • https://nijeliwawinezim.weebly.com/uploads/1/3/4/4/134497061/dujozabipaxoxatam.pdfIn PDF document text
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/reluzanek_xegolu_vefuxumubefiw.pdfIn PDF document text
    • https://dolakavurig.weebly.com/uploads/1/3/4/6/134647128/rajunujavijob-meliwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379379/normal_5fe0232ddaf90.pdfIn PDF document text
    • https://pefojefevofat.weebly.com/uploads/1/3/4/6/134659321/488bcc9fb133eda.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/nezanurugega/81589003776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f771b10-56e2-4738-b61d-85e89f8ef295/mutants_genetic_gladiators_mod_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a242f40-8886-41f0-a0d0-143051c7d65a/xokinit.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/basic_conversation_skills_worksheets_for_adults.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_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 5556 bytes
SHA-256: b198304853c43cfe33b139aeb5a92402322f8c0c9ff35b44294189177a7b94ad
font_01_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 11184 bytes
SHA-256: f984117c251c8d20b3f58c301da8aaf8d38e68c1a24c88ad5d8254aad020c4cf

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