Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb257f241ff3bbbb…

MALICIOUS

PDF

82.6 KB Created: 2021-04-04 21:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 807656c28ab858124018fab87147de0f SHA-1: 25c0a711981e11f623b466ae42498fd7cbf925d3 SHA-256: bb257f241ff3bbbba8ba709705badddb160efd1cacb50fafe7e4886ad07abd63
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to improve search engine rankings for specific keywords. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document's apparent purpose of providing "ccna dumps" point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-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://vilenefex.ru/award?keyword=ccna+dumps+200+125+pdf+free+download+2020
    • https://kagoxikefo.weebly.com/uploads/1/3/4/6/134649289/9abd396e3a1c.pdf
    • https://cdn-cms.f-static.net/uploads/4489247/normal_6026cc3a104ed.pdf
    • https://cdn-cms.f-static.net/uploads/4407807/normal_600c19770a73e.pdf
    • http://zukesijinizik.mywebcommunity.org/cambiar_archivos_de_word_a_online_gratis_small.pdf
    • http://kumajamefe.getenjoyment.net/palovo.pdf
    • https://rovenefewapug.weebly.com/uploads/1/3/0/7/130775308/vexixel_kemewaz.pdf
    • https://wosufixojiniki.weebly.com/uploads/1/3/4/7/134720754/xerejedikose.pdf
    • https://cdn.sqhk.co/satidaruxami/hhfig4O/refubu.pdf
    • https://luresigixake.weebly.com/uploads/1/3/5/2/135294948/lisubigugifew_wogev.pdf
    • https://nudonadutosaj.weebly.com/uploads/1/3/4/5/134595964/4eff3fc9.pdf
    • https://cdn.sqhk.co/dagufiwus/Jjbgigj/83692273838.pdf
    • http://favunewesazut.sportsontheweb.net/56118425614.pdf
    • https://cdn.sqhk.co/mekekomubun/PBiihqy/12490427784.pdf
    • https://girodexusaxemo.weebly.com/uploads/1/3/5/3/135388358/9e8314f21.pdf
    • https://telenegogak.weebly.com/uploads/1/3/4/5/134522167/denapujibamu.pdf
    • https://rugabefek.weebly.com/uploads/1/3/0/7/130775918/fefiv-tineruxeduge-wazufabo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vakogez.myartsonline.com/16217871625.pdf
    • http://zotubune.myartsonline.com/funimixukufa.pdf
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_f3258cbe969745848257b04e700dd2b0.pdf?index=true
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_342bf6b7881a4815b1837b1383b966d9.pdf?index=true
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_8d4b4e9f0f414caebb301dfb1aaf16d6.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea95.bin
d027334adfc7aeee971111c51d7fb336e89944d8367b4508006ea323985a3fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 5748 bytes
font_01_sfnt_off0000fe2c.bin
21a1afad5750984106a5df274e5e3b744c3721ca7d6ed7af2f15b7be5dce0496		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 11544 bytes
font_02_sfnt_off000125c2.bin
f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125C2 16144 bytes

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