Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6ada9a35de3615…

MALICIOUS

PDF

71.1 KB Created: 2021-04-17 15:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16c0932480df7a850c332555d14859ee SHA-1: 57326af9138ff3ebc614908dd18d8a68af61ba0e SHA-256: 8f6ada9a35de36150ba514eded800154590cdaaa6d79b6871374eef776055895
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL pointing to 'baarspo.ru'. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://baarspo.ru/strik?utm_term=questions+to+ask+in+pre+marriage+counseling
    • https://cdn-cms.f-static.net/uploads/4425924/normal_5fd85e802394c.pdf
    • http://lavkavkusa.store/60853216045d83fz.pdf
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fca414b26eee.pdf
    • http://opensol.xyz/coleman_powermate_4000_watt_generator_specsoecpn.pdf
    • https://cdn.sqhk.co/tojegaxamox/0hjhgjj/96479787744.pdf
    • https://cdn.sqhk.co/navimoxa/80iejfP/learn_chinese_free_online_mandarin_audio_courses.pdf
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdf
    • http://goproits.com/serial_de_instalacion_windows_8.1_32_bitst2sro.pdf
    • https://cdn.sqhk.co/dufadafakuti/fByf7gg/clash_of_clans_pc_private_server_download.pdf
    • https://cdn.sqhk.co/birugafomafo/hiLw2jb/tebudasajofizoneweworu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/da1d8f3c-1877-4609-9bc5-8683d03e21dc/wifijotuj.pdf
    • https://uploads.strikinglycdn.com/files/2ca8dde8-5c0c-4d37-9ae9-d1b26d55d2c6/jekerukabugorewugalozula.pdf
    • https://uploads.strikinglycdn.com/files/1355bd04-cab6-480f-bd55-469b1aace051/the_vampire_diaries_season_8_episode_15_bg_audio.pdf
    • https://uploads.strikinglycdn.com/files/3550e2f5-45a6-4270-abaf-aa4342c0b946/57799453885.pdf
    • https://s3.amazonaws.com/resisuna/solving_consecutive_integer_problems_worksheet.pdf
    • https://s3.amazonaws.com/figugipopar/kebetidijifitit.pdf
    • https://uploads.strikinglycdn.com/files/074a1618-71eb-4fa1-a989-a52890bdc3fd/jibebutigum.pdf
    • https://uploads.strikinglycdn.com/files/9c8617b9-9c4d-4513-9bc4-858d6ab945cb/54618785658.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_off0000d8ee.bin
c6b35cc13fa20b92f086e57258d2c6247ebfb34b12c5fdb1150207f7d86715bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 5376 bytes
font_01_sfnt_off0000eb2c.bin
00b223609fde6fa33284ed2a8a12d1059e27d02f3be96390d5673193e8313e7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 10592 bytes

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