Malicious PDF — malware analysis report

Static analysis result for SHA-256 8297a34ef64dab0b…

MALICIOUS

PDF

70.8 KB Created: 2021-06-09 10:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89a6930a0904be2fdf807529bdf3cbb5 SHA-1: e0a3d0398116b4c2559410b2ce37cae93a6ffbe6 SHA-256: 8297a34ef64dab0b1c506d064a27905f5e32a544b348ea781a0df5e9cce0543d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation scheme. ClamAV and ML classifiers also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to redirect users to potentially harmful sites.

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-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://leonvi.ru/123?utm_term=rabbit+ears+template+to+print
    • https://static.s123-cdn-static.com/uploads/4417659/normal_6001fad54de30.pdf
    • https://nuzaguwimera.weebly.com/uploads/1/3/4/4/134492670/pevukojivizedud.pdf
    • https://cdn-cms.f-static.net/uploads/4444123/normal_6015a55340e98.pdf
    • https://wuwudaxu.weebly.com/uploads/1/3/4/4/134493329/nazajobar.pdf
    • https://fitoposibex.weebly.com/uploads/1/3/4/3/134364930/8075844.pdf
    • https://cdn-cms.f-static.net/uploads/4448539/normal_5fd6fe73740e1.pdf
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/43e085d21.pdf
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/fadufov-kezagabevop-lazutazokegimi-femasak.pdf
    • https://xaluwidadi.weebly.com/uploads/1/3/4/8/134860769/579f57df6b.pdf
    • https://ginefudev.weebly.com/uploads/1/3/4/4/134454890/7727217.pdf
    • https://pavuxutekukos.weebly.com/uploads/1/3/4/7/134704216/jagekikomomabo_zuwepimikomarez_mavomamipe_jakizupemokavox.pdf
    • https://lafibovuvi.weebly.com/uploads/1/3/4/6/134653173/8a5fe92cf7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wurutaw.pbworks.com/w/file/fetch/144628881/wetilisigigexepovafewam.pdf
    • http://veposasidot.pbworks.com/f/99418141813.pdf
    • http://fijovolumi.pbworks.com/w/file/fetch/144834141/sleep_hygiene_handout_for_adults.pdf
    • http://siseraxoru.pbworks.com/f/modals_perfect_exercises.pdf
    • https://uploads.strikinglycdn.com/files/58bd0d1e-f062-4b13-ac76-8c9e94f9d759/61594932633.pdf
    • http://zupelapowi.pbworks.com/f/faragepixepetegexokew.pdf
    • http://doxawadar.pbworks.com/w/file/fetch/144638136/73993540444.pdf
    • http://wukexav.pbworks.com/f/roduxebebupameb.pdf
    • https://uploads.strikinglycdn.com/files/6564250e-9504-412d-b8f0-40152cd3e155/how_to_turn_on_hp_pavilion_keyboard.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bf.bin
63ee679485e0d1f931e8778a2cde342093e2e58dfb42a5e5015377a9dbef65a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 5112 bytes
font_01_sfnt_off0000e708.bin
a29f3d0ebe5571c74ef5d811cb452ab2b3b17c68a455cb09f938b96a9fbde74e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 11092 bytes

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