Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b03f094d4241b49…

MALICIOUS

PDF

80.5 KB Created: 2021-02-20 04:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a82a2904213a43388262c46ebaab9a39 SHA-1: 5b7c033767c8900a5bd25a3a5ba254dba5d76a38 SHA-256: 4b03f094d4241b495207028ce5e429d27f5ceb6cd0ab15865c374c73c07fad7e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to a URL containing 'strik', potentially indicating a phishing or malicious redirection attempt.

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://druttle.ru/strik?utm_term=how+to+win+rap+battles+in+roblox PDF link annotation
    • https://sasifebuwanozag.weebly.com/uploads/1/3/4/2/134234849/7544700.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/iWianUE/disepefu.pdfIn PDF document text
    • https://lexikusu.weebly.com/uploads/1/3/1/4/131438729/f0dd32.pdfIn PDF document text
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/43b4a8a4412a86.pdfIn PDF document text
    • https://ziwuwozapa.weebly.com/uploads/1/3/4/5/134517717/gidozurom.pdfIn PDF document text
    • https://zatuzura.weebly.com/uploads/1/3/1/4/131453499/1735838.pdfIn PDF document text
    • https://zisinifaja.weebly.com/uploads/1/3/4/5/134599776/rumerujigo.pdfIn PDF document text
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/purijefes.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/jggifha/78664372495.pdfIn PDF document text
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/2644758.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://timavutiziv.epizy.com/zefat.pdfIn PDF document text
    • http://gowobubovojot.epizy.com/ruwodo.pdfIn PDF document text
    • http://mibavipef.epizy.com/chapter_33_the_great_depression_and_the_new_deal_answers.pdfIn PDF document text
    • http://lidiremuvuzanas.rf.gd/big_manistee_river_fishing_guides.pdfIn PDF document text
    • http://jemuvevidesa.epizy.com/68282848682.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_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 5076 bytes
SHA-256: 59e5b8ca6eead35646365ee5b11a4afd5dcef28fcbea5fbbf66223c7ea4ad400
font_01_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 11472 bytes
SHA-256: c6f4673bc3aa0ed6446066e6a9a1515ae15870e1d9c2a34cde223892d88674a6

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