Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ab804d95464ff8…

MALICIOUS

PDF

77.8 KB Created: 2021-03-19 09:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8a7c7c879da2f64e99691b84b62c129 SHA-1: b86e160729ab3229209114f62b423d011a4e6a60 SHA-256: f0ab804d95464ff89a2e4958bb9140603caaa028e51367c47f7d0e853b568efd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a large number of external links, forming a link farm, with the primary URL being zajinet.ru. The heuristic 'PDF_SEO_LINK_FARM' suggests the PDF is designed to generate traffic to numerous other PDF files, likely for SEO manipulation or to host further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=game+of+thrones+book+1+wiki
    • https://cdn.sqhk.co/tuvameboroke/hgbiafD/flip_diving_apk_mod_2019.pdf
    • http://allrecipes.pro/sedative_and_hypnotics_pptfg2ic.pdf
    • https://cdn.sqhk.co/zejegure/LL9oibO/instagram_captions_for_fall.pdf
    • http://litvinenko.xyz/169858393oj55z.pdf
    • https://cdn.sqhk.co/fosuzonarefi/ihbgf9R/furnace_rust_guide.pdf
    • http://nnorm-id.com/77857009714fbett.pdf
    • https://cdn.sqhk.co/fujotojaxob/gOjdijL/prison_break_season_4_ending_review.pdf
    • http://rankingcoach-apps.com/194002640l5ymg.pdf
    • https://cdn.sqhk.co/reromiwo/ijjiiia/real_football_helmets.pdf
    • https://cdn.sqhk.co/golemejexeno/ieGjeif/instagram_download_story_hd.pdf
    • http://copyrightmediahelp.com/faratotobosoxekigewq99bg.pdf
    • http://kraftmann.su/what_is_the_new_viral_dance_called395ed.pdf
    • https://cdn.sqhk.co/mapibeze/cie9Sib/56300830064.pdf
    • https://cdn.sqhk.co/legezuseg/hgcjfhb/gba._emu_apk_latest_version.pdf
    • http://betmoy57.com/xipuw228xk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xigufogadenake.epizy.com/geometric_series_worksheet_kuta.pdf
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_e9daaa2f79494869b05967661f34233c.pdf?index=true
    • http://potovoz.rf.gd/bhagavad_gita_in_gujarati.pdf
    • http://kegotetebam.epizy.com/clockworkmod_recovery_apk.pdf
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_4b9c22c99c974c5686c76eb5acec8285.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f290.bin
e71804bb8bfbf0cc84a46dd3bbf2f82ecd369670ef793d8e0370310d06333754		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 5356 bytes
font_01_sfnt_off000104b8.bin
d99e882846e15aef9aeabd7030ef1a3b669a1c9d3c565551a1f9f36a98270983		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 10964 bytes

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