Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e28546fd2a830a…

MALICIOUS

PDF

76.2 KB Created: 2021-03-11 01:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4c72d324989f1bc3bb274ab3966a9325 SHA-1: 622b31a5688acbc7deceac7b7697a11b3b6127e5 SHA-256: c3e28546fd2a830a1a0096dcea3daa426624773ce96a4a6c4b43e45443371ae7
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm hosted on disposable domains, with numerous external URIs pointing to other PDF files. The document body, though heavily obfuscated, contains text related to the 'Australia open 2020 winner list pdf', suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/award?keyword=australia+open+2020+winner+list+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393188/normal_60371a57c2e2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484818/normal_5fe81902cca00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491157/normal_5ff2484b3be54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484990/normal_5fdc39923b47b.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/kewejorewetilufegojusif.pdfIn PDF document text
    • http://uscreditcheck.info/choreiform_gait_description5cj3g.pdfIn PDF document text
    • http://recepty-dd.info/87094547110xg9q9.pdfIn PDF document text
    • http://zesamoa.online/38932614253ohloq.pdfIn PDF document text
    • http://businesslinecenter.com/57579690328b1pgx.pdfIn PDF document text
    • http://carishr.com/jensen_vx7020_firmware4w239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475987/normal_600ed8ab1ba3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470553/normal_5ffdb9057d6d5.pdfIn PDF document text
    • http://select-get.top/kitchenaid_gas_range_replacement_partsqiaqh.pdfIn PDF document text
    • http://believes.space/baby_boss_2_moviey3d6z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468530/normal_5ffba5ec26d4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488804/normal_5fcf3b8f432cd.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/yamaha_rx-v673_manual.pdfIn PDF document text
    • http://teenagetutor.net/vivimoxojiw32m1b.pdfIn PDF document text
    • http://vorecan.fun/84752577408x2ci.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5fd1c7fa66717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuziwaji.epizy.com/apprendre_allemand_rapidement.pdfIn PDF document text
    • http://kusotuwomaru.epizy.com/papazosarusabun.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_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 5392 bytes
SHA-256: 45627f1df93e17679e4561f6e606d9c889035ed8717a876b00f22ee9996f902e
font_01_sfnt_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 10752 bytes
SHA-256: 1a2b7861eee1b152b56d51a02398343c30f3101ec3cc55552d1c1aafdf75b591

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