Malicious PDF — malware analysis report

Static analysis result for SHA-256 540105c75b510c8d…

MALICIOUS

PDF

77.4 KB Created: 2021-03-16 04:03:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c686faafe70175885758d04387e5f55a SHA-1: b07f1c72d6c855b0addf3ae1d99dabd27fdfb5f9 SHA-256: 540105c75b510c8d196dd558be1b834bc2c2996f24eebfebc682def3c96f3a66
156 Risk Score

Malware Insights

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

The PDF document is designed to appear as a search result for a specific PDF download, likely to trick users into clicking on malicious links. It contains a large number of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=iupac+periodic+table+2020+pdf+download
    • https://bepefuligifeval.weebly.com/uploads/1/3/5/9/135981888/gapukuxobo-bazasugumurune-nibebumef-xosifiva.pdf
    • https://neruwutuwi.weebly.com/uploads/1/3/5/9/135960217/disetawagoti.pdf
    • https://kopabiziruzoxol.weebly.com/uploads/1/3/1/4/131406592/rubejozeki-xiwojupobakuw-toradive.pdf
    • https://cdn.sqhk.co/wivenute/ieJu5Hr/64462395964.pdf
    • https://static.s123-cdn-static.com/uploads/4372399/normal_5fcc525975197.pdf
    • https://bovuxugiz.weebly.com/uploads/1/3/4/9/134901291/niluzobiparot.pdf
    • https://cdn.sqhk.co/zanemulazif/bheegd3/cat_meowing_sound_clip.pdf
    • https://cdn-cms.f-static.net/uploads/4410459/normal_6045f2b01211c.pdf
    • https://cdn-cms.f-static.net/uploads/4422367/normal_6039a5261c5a5.pdf
    • https://static.s123-cdn-static.com/uploads/4469849/normal_5fededdfec20f.pdf
    • https://mopelajizefuxo.weebly.com/uploads/1/3/0/7/130739073/baronekijemovono.pdf
    • https://cdn-cms.f-static.net/uploads/4366385/normal_6037ddbe49176.pdf
    • https://bojurejid.weebly.com/uploads/1/3/4/8/134887271/livigamibuzefor.pdf
    • https://static.s123-cdn-static.com/uploads/4385204/normal_60040c46444ff.pdf
    • https://static.s123-cdn-static.com/uploads/4424666/normal_60065ab714f4e.pdf
    • https://cdn.sqhk.co/zanivuwiduvo/hkHeAih/xitutoxerufa.pdf
    • https://static.s123-cdn-static.com/uploads/4406782/normal_60095e6235d2e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nemafu/29416828546.pdf
    • https://s3.amazonaws.com/zinudipir/ivory_platform_wedding_shoes_uk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effe.bin
9ac6f38992c1c253efcc0b709c850f8819c79c8699df5ae430ce37c31a932c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 5412 bytes
font_01_sfnt_off00010282.bin
98d82cc3ef1a4ecb281dcc39a369d08bc9fa13ac4f5b336520dd527be5c0c42b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 10580 bytes

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