Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4c5fa139d0ea37…

MALICIOUS

PDF

96.5 KB Created: 2021-03-18 19:29:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 709b4e30c9b77210f23dbee592a192c3 SHA-1: f585181e5b143f92ddbed350e514ed0a11c39540 SHA-256: db4c5fa139d0ea376a9f27f7bbb3b1c46ea544aa1d6410dcb422103946198a1f
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious phishing content. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm for software, likely a lure. The PDF structure and the presence of many external links suggest an attempt 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://gimoguvi.ru/strik?utm_term=contact+database+management+software+freeware PDF link annotation
    • http://wowitaly.pro/monitoreo_de_redesjvlo0.pdfIn PDF document text
    • https://gakurajoduradi.weebly.com/uploads/1/3/4/1/134131237/vudumazi.pdfIn PDF document text
    • http://romeita.fun/56061160913oq2aj.pdfIn PDF document text
    • http://free-at.pro/jutudafemawojunna7r2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_604d19962264a.pdfIn PDF document text
    • http://xejevojesinil.22web.org/11885887595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_6041b30153def.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454672/normal_5ffb5694def4c.pdfIn PDF document text
    • http://santecmb-sarl.com/buxezafaxilovapoj5q88.pdfIn PDF document text
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/b3db61b3ede52.pdfIn PDF document text
    • http://znohist.site/72279394170vg38v.pdfIn PDF document text
    • https://wimaxexuxiwob.weebly.com/uploads/1/3/0/8/130874544/wulezutut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_5235f6278b694a899e0f32c739117cca.pdf?index=trueIn PDF document text
    • http://wewenak.rf.gd/56107344026.pdfIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_a4e2a563c92c4ce383bdf6afb5d5e38a.pdf?index=trueIn PDF document text
    • http://mevafefulasi.rf.gd/busizigapelil.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_e712464328e94d4798c6e9bbfe70f151.pdf?index=trueIn 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_off00013c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4C 5444 bytes
SHA-256: 6adc0b0267389e947796ef5c5750ca6c96ae38e367e02b77064f8d701af7d5fe
font_01_sfnt_off00014ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC9 11004 bytes
SHA-256: 5cb4bf3eb744d07699a9cf1f20b999d8db9f6912790d83d3ed33557d20da97e3

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