Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ca1333d7a5bcb6…

MALICIOUS

PDF

86.2 KB Created: 2021-02-18 20:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64f1db63cf7606211a310fb894e9f76d SHA-1: 70aa426b9c380d13a35c8d4480454297991dc779 SHA-256: 03ca1333d7a5bcb6f3275cfe7832a7d13735c2ab275bac200894466c7c57818b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain ('jacksth.ru') that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious content, potentially as part of a larger phishing campaign or to download further payloads.

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://jacksth.ru/wix?keyword=huang+lei+son
    • http://denizan.com/84100905469lkn38.pdf
    • https://cdn-cms.f-static.net/uploads/4477630/normal_6009be58a06d0.pdf
    • https://cdn-cms.f-static.net/uploads/4469631/normal_5fda3bdc7b8c2.pdf
    • http://laxana.ru/lofijejamosusorfy1r.pdf
    • https://nexiwurepefisov.weebly.com/uploads/1/3/4/3/134372078/6000a9446ef.pdf
    • http://padlamadla.site/saudi_arabia_visa_application_form7za9j.pdf
    • http://hookup668.site/kitserver_13_1.04_indirihi8c.pdf
    • http://otomail.business/smart_sim_card_philippines_rechargebyrx9.pdf
    • https://tewafegode.weebly.com/uploads/1/3/5/3/135350941/walam.pdf
    • http://lifeeuro.info/nekobilujiwugusexomiwisez4r6rg.pdf
    • https://static.s123-cdn-static.com/uploads/4416299/normal_6002008cd2745.pdf
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/todefazadigalosije.pdf
    • http://virnet77.ru/download_adobe_illustrator_cc_utorreyzxvo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vonutavekip/allen_bradley_powerflex_40_manuale_italiano.pdf
    • https://s3.amazonaws.com/sojebelevenex/56028115186.pdf
    • https://s3.amazonaws.com/falevi/rowdy_anthem_songs_2018.pdf
    • https://s3.amazonaws.com/mogipegi/gejisuxevavegebalusoduzi.pdf
    • https://s3.amazonaws.com/nemafu/58543699029.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ca.bin
f9136888c8ae85a10274a2c7d2d99ecea60eb8d1f6904f4a4af2e46f877360d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 13144 bytes
font_01_sfnt_off00010ae4.bin
ade51379d4454803edf3eb24460872d39ca54944631c44e84509bb5fde34abf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE4 4720 bytes
font_02_sfnt_off00011b04.bin
3003033d32b549b9dd9b47ac47183cefca878bf8c5734a14e0da67e1f74327d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B04 15756 bytes

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