Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4163437b668cb9d…

MALICIOUS

PDF

66.1 KB Created: 2020-12-20 03:02:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e961f03b99e86b759b50890599d3d8c9 SHA-1: 06616741a3ff19296fd00fb461ee37350e3e62bd SHA-256: b4163437b668cb9dfef7739d7140fe7cddc4b65eae4f81dcd519d56321a60c14
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, including a primary link to 'traffking.ru', suggesting a phishing or malicious redirection attempt. The document body, though partially corrupted, contains text related to 'montgomery little league fall ball', likely used as a lure.

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
  • 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.
  • 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://traffking.ru/strik?utm_term=montgomery+little+league+fall+ball PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495387/normal_5fad341e80e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392658/normal_5f9e375b15d27.pdfIn PDF document text
    • https://piwirajaluz.weebly.com/uploads/1/3/5/3/135312697/5852948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450347/normal_5fb80df777e1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_5f8e43af35c57.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/1929004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_5fafc0f19d775.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/barevobevenijumolus.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/994fb721-c9e3-4008-bcb2-cad4d07512f2/93423177092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54648a70-1853-4ee2-9046-9ac96a1a2418/hotpoint_aquarius_fdal_11010_dishwasher_flashing_lights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed3d706f-06d1-47c1-b5c8-1490a7d3a6b8/vobijubivirojozig.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_off0000c3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EA 5156 bytes
SHA-256: 213d7817a48d733263b6538e1e5b5d12eb5d150090219a2dd684418f8bf92c34
font_01_sfnt_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 11564 bytes
SHA-256: aef181d175fd030c4d01f328f41f0b8b1d8506ee48c903b777009b78accc2aef

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