Malicious PDF — malware analysis report

Static analysis result for SHA-256 e759f1b0b1e9b5bd…

MALICIOUS

PDF

81.2 KB Created: 2021-03-18 04:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1a5eff7d51762478457d4f40057dcc8b SHA-1: d633022f1e709da815b88db13f7e8b69469cb6a5 SHA-256: e759f1b0b1e9b5bd1539d886cf6fb846a79f21474ae39bc8a365cf1fdedbb109
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest the PDF is designed to redirect users to malicious sites for further exploitation.

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 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://jacksth.ru/wix?keyword=hush+hush+2+pdf+online PDF link annotation
    • http://lighterusb24.site/subgame_perfect_equilibrium_examplesdjukf.pdfIn PDF document text
    • http://chambreapp.xyz/litaj86h4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424013/normal_602c0b7925507.pdfIn PDF document text
    • http://wekeb.space/mexodawuvexamowixabudwlj6r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414502/normal_5feb909300288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_6038bf005863a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_604a838e205b5.pdfIn PDF document text
    • http://padlamadla.site/pabafikarejafubedofw2jwr.pdfIn PDF document text
    • http://gejulavofanutar.mygamesonline.org/vojudo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383802/normal_6036b420ba356.pdfIn PDF document text
    • http://papepoxavabezaf.iblogger.org/fusiledigotodoxivunun.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://weguxaja.rf.gd/simuwiwa.pdfIn PDF document text
    • http://gomojopovin.rf.gd/the_science_of_mind_management_review.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/mekobi.pdfIn PDF document text
    • http://xotaferuju.myartsonline.com/english_language_lessons_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/9897768597.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_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 4716 bytes
SHA-256: ab80cf4589a7c4af48f62301ad57d19fb3e38cae855c0ba3b80301c13f952f2e
font_01_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 10368 bytes
SHA-256: 0838c94e8a4aa2c136aac0cd7d46de590fa2b737df2ad8c79de767e9bc95770a
font_02_sfnt_off00012993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12993 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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