Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f44c9e6d135a44…

MALICIOUS

PDF

75.6 KB Created: 2021-02-11 04:13:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b7da14577f51758d3793e2288e0d5257 SHA-1: 6676839a8bbdb1ed0b197dfbfcaccfdf27ac3d38 SHA-256: e8f44c9e6d135a44a6ed65372884418bf58a5aa4e69fa417684305f2839069a5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL suggesting a lure related to a 'ge profile trash compactor repair manual'. The presence of multiple disposable domains and link farms indicates a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=ge+profile+trash+compactor+repair+manual PDF link annotation
    • http://fruit-citrus.space/2563309089654olb.pdfIn PDF document text
    • http://clobuss.ru/areas_figuras_compuestasepygu.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/jbrgvjb/68229579778.pdfIn PDF document text
    • http://senteber.site/fabujukilunfx76e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_60167012c988d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486368/normal_6019c748aeb4a.pdfIn PDF document text
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/wexidekipap_raxarizokaku_mudafeza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410717/normal_5fcd56f855651.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/ibZBia5/62244009095.pdfIn PDF document text
    • http://sokepazetovul.22web.org/accidental_death_of_an_anarchist_analysis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450138/normal_6010a557c8d9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374957/normal_5ff0714a8d034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_601723e38ab11.pdfIn PDF document text
    • http://revenularozudo.66ghz.com/sample_personal_monthly_budget_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381098/normal_5fe3061042b00.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://pesuvomekujidi.rf.gd/ekahau_sidekick_user_guide.pdfIn PDF document text
    • http://gelidug.epizy.com/meromu.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_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 5168 bytes
SHA-256: 375f0897566a4d60f0e162e61339c730baa95c3241dff88955ffc096a9c6d8d3
font_01_sfnt_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 10308 bytes
SHA-256: 2e07d04d0b740bbdd7e0bb2de5875782596bfa2cfccaaf12e6ab525b07cd99a4
font_02_sfnt_off000112a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A5 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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