Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2fbc5e354493f6…

MALICIOUS

PDF

77.2 KB Created: 2021-04-06 02:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f662cf5012c842bf688f246654d6a874 SHA-1: d97b3d7aa204e952cb973a1023db5213d9d71ffa SHA-256: 9a2fbc5e354493f62ea3cd130121fdb847e9535ca720212165c44ec88950b9ad
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'Altium designer 17 manual pdf', indicating a lure to trick users into visiting malicious sites.

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://zajinet.ru/award?keyword=altium+designer+17+manual+pdf PDF link annotation
    • http://rasidafepu.mypressonline.com/amarillo_by_morning_violin_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453553/normal_60155c427c73c.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/hd_bengali_movie_site_for_pcbgxga.pdfIn PDF document text
    • http://axacheat4.xyz/suxefidekuzoxefidasomazikjx52v.pdfIn PDF document text
    • https://cdn.sqhk.co/wafixagi/n85ejje/8230756537.pdfIn PDF document text
    • http://mofopafilubo.22web.org/54438380889.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482618/normal_5ffabc60d4434.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/hjgIhc3/human_game_fall_flat_human_walkthrough_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454550/normal_604b54056d649.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/digL2jb/prayers_of_thanks_to_god.pdfIn PDF document text
    • http://tadurarawi.mypressonline.com/dojat.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuzajomugi/sShibsT/cake_decorating_supplies_walmart_canada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373788/normal_5ff07c8364ce7.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/jjnghhe/pixel_force_2_mod_apk_1._4._1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466161/normal_5ffcc824cb683.pdfIn PDF document text
    • http://vakexuk.22web.org/motubovog.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/triumph_thruxton_900_service_manualx9pat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 5480 bytes
SHA-256: 3f0f7d1dbdd3b278dd9484c5dfde41508c0b3aa4a40a5995c3ac25e8b9cbd7c6
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 10540 bytes
SHA-256: c32b2de330b36d4eb10c465cb7101748726c74209ea6b6bc48bf77ee37b656f0

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