Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7928be59cd0441…

MALICIOUS

PDF

73.0 KB Created: 2021-02-20 20:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1a180769636125a0ebbbdea56d4b9d18 SHA-1: aeaa55a81a35549c132226249acf987512de1188 SHA-256: 2f7928be59cd0441ab072982d820669cc62fc98e16b4bca60a1534a1ac8eba15
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism for malicious content. The primary URL, https://baarspo.ru/strik?utm_term=yamaha+rx+v673+remote, is likely used to redirect the user to a phishing or malware download page. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://baarspo.ru/strik?utm_term=yamaha+rx+v673+remote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454673/normal_6021ccb27a12e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476282/normal_5fd0583a9a75c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470698/normal_5ffe02ee94e9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470688/normal_5fde3cd233187.pdfIn PDF document text
    • https://rolobidixogiru.weebly.com/uploads/1/3/1/6/131637372/209168.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5ff7e737d4a9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_60310f1769fba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_5fd330d834417.pdfIn PDF document text
    • http://jetelijunejuk.iblogger.org/71030942706.pdfIn PDF document text
    • https://renikafajuwigag.weebly.com/uploads/1/3/4/3/134317319/basiwudabejisobotuv.pdfIn PDF document text
    • https://jupojunidukeze.weebly.com/uploads/1/3/4/0/134012404/5fa532cfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368982/normal_5fcced148d5d4.pdfIn PDF document text
    • http://woxupepij.iblogger.org/fevudemozikapekemeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472486/normal_5fdc72ef9535f.pdfIn PDF document text
    • http://titibes.iblogger.org/template_flyer_illustrator_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5ffc9cba50927.pdfIn PDF document text
    • https://zixaxufomomofir.weebly.com/uploads/1/3/0/7/130738537/b0d4bc4e487fe9.pdfIn PDF document text
    • http://nejozewowedona.22web.org/kepegexemis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixoravu.epizy.com/94725999550.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_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 5200 bytes
SHA-256: 7f6042ea9dc17916c203341ef41b894a7cbc33309d9b15a0e1c9c61da4f320b1
font_01_sfnt_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 10348 bytes
SHA-256: 6643dbe93a075788b72399b20631d248fc62140e054d949dd89410cc0e406e3f

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