Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00cd03fe0cfbf69…

MALICIOUS

PDF

76.8 KB Created: 2021-05-15 09:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8c4591c06ed4e65a9505961fa21799aa SHA-1: 82381b9d828ae2ee05fe2ab9445d4195ce14099c SHA-256: a00cd03fe0cfbf692acad6c2d9739602ec657396b23011fb644beaa092f2427d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and redirectors, indicating a link farm designed to obscure the final destination. The presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt.

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://leonvi.ru/strik?utm_term=htc+m8+vs+m9+battery PDF link annotation
    • http://canlisohbetim.net/what_makes_a_childhood_traumaticg0vpb.pdfIn PDF document text
    • https://cdn.sqhk.co/vapiwibisa/Tgijagj/wovazimironofopidin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_6022f079024d5.pdfIn PDF document text
    • https://guvorike.weebly.com/uploads/1/3/4/2/134266232/ce8cedd5f7151e.pdfIn PDF document text
    • http://kifikawi.66ghz.com/sodastream_fizzi_one_touch_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/josedinis/vlpXifA/snake_and_ladder_king_game_play_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_5fd135e1d3f2e.pdfIn PDF document text
    • https://gufagopa.weebly.com/uploads/1/3/4/6/134660265/narobogaxatazig.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/gjc2hh8/64159196965.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369501/normal_5fe00224cb8ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463010/normal_6027d04a7c422.pdfIn PDF document text
    • http://rcasino.info/bizifobafopisorh5sj.pdfIn PDF document text
    • http://fasebumexu.iblogger.org/orbit_2_outlet_hose_timer_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/julukimesof/iarhiyC/watch_face_neon_city_wallpaper_wear_os_smartwatches.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b079771-b74f-4420-9f7f-ab0bea1c4fb0/momodopaw.pdfIn PDF document text
    • http://kejajuzajibig.rf.gd/73060888751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c13e6cef-5515-43fc-8f85-5110fc5b979d/how_to_put_gears_on_a_mountain_bike.pdfIn 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_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 5528 bytes
SHA-256: 65c91f96286cfd69b10dbc07afc04713907f652183d192be03e4698093e00c44
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 10968 bytes
SHA-256: 8146a5a22b89a20c8aa5aecab3169dec7b19516e36a6925cfa1cb5f5a0d4e805

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