Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b3f505e7936014…

MALICIOUS

PDF

74.7 KB Created: 2021-06-05 09:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 54abced4b8f31bf27ce52462df05e5bf SHA-1: 2519ea8f25ca41812266c0dd04acd96fff0a3c27 SHA-256: e5b3f505e7936014e455e87ee3ed6679e834b1e1c292efdb517273118ce8d2aa
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. ClamAV detected it as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The embedded links likely lead to phishing sites or further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/pbw?utm_term=how+to+setup+a+hotspot+on+a+tracfone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378846/normal_5ffc5729a958f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4402953/normal_60b29451eb6c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479710/normal_606743cba68a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402718/normal_6001453b86ca1.pdfIn PDF document text
    • https://vebazefi.weebly.com/uploads/1/3/4/0/134040586/1865178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443325/normal_6050f511aa9e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_6056b8c7eacaf.pdfIn PDF document text
    • https://tadizusojad.weebly.com/uploads/1/3/2/7/132712436/267510.pdfIn PDF document text
    • https://jaxumemiri.weebly.com/uploads/1/3/4/4/134465633/4010791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_604cb8369ba17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449777/normal_60278671bac58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427284/normal_5fe15282691b3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4445550/normal_60b483eedfd67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_6054a972668aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_605ef95ae9334.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/dcfe11dd-7747-4165-9174-229df48f9c96/53187867744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b58e154-1fde-4990-a82a-e07638dca59e/vigesanomiba.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/p90x_kenpo_x_worksheet.pdfIn PDF document text
    • http://nixefijevumu.pbworks.com/w/file/fetch/144554652/how_many_types_of_cladding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8395a800-592c-431f-8a7e-6c79d6c3ceb1/nisalitagivoz.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_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 5124 bytes
SHA-256: 973a1fc976a94823cb1c0de3a0d13455fb40ef500622daa0e81c39a49f849fc2
font_01_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 11112 bytes
SHA-256: 0dcb60c5bfc217355fe022b27846dd975a503fb71dc723f19c22479828ab26ab

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