Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb9fe2cbac72ed2…

MALICIOUS

PDF

75.7 KB Created: 2021-02-17 14:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4ad1fbb0eb07e9e6e2ab2d359ba90139 SHA-1: c1e51a2c41f6f255681b9818286da5b97aa74a6f SHA-256: bcb9fe2cbac72ed2b4794c9e059aca1c1b7524b5346d9340e8a62b346626aee7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. The primary malicious URL, 'https://maypoin.ru/strik?utm_term=dodge+avenger+2013+engine+swap', is likely intended to redirect the user to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://maypoin.ru/strik?utm_term=dodge+avenger+2013+engine+swap PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475741/normal_5feb7fd0690c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489988/normal_5fc6cdc995552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457311/normal_6018621adc777.pdfIn PDF document text
    • http://hamsterbig.com/inner_child_worksheets3s6c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471959/normal_5feb4404c4b8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_5fd12dbe72da1.pdfIn PDF document text
    • http://uaregroup.com/word_association_test_with_sentenceslitaw.pdfIn PDF document text
    • http://kluruu.info/zhu_scalp_acupuncture_bookni5x8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_600e07b65897e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bimivopi.epizy.com/xaloposudejatevixinogov.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/7646888722.pdfIn PDF document text
    • http://zaxigadanu.rf.gd/64229462373.pdfIn PDF document text
    • http://savikolapuxol.rf.gd/autohotkey_tutorial_espaol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 5444 bytes
SHA-256: e27a87488ac523958757017d5762b4074fbe1537dcb866a58c5ab07b19d6e282
font_01_sfnt_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 10828 bytes
SHA-256: 59bf9e1dfc1881d53987f607a4c361a290fea18d27f52801c76b660f1be5e8fe
font_02_sfnt_off00011400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11400 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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