Malicious PDF — malware analysis report

Static analysis result for SHA-256 676dcc34f258a01b…

MALICIOUS

PDF

65.5 KB Created: 2021-02-18 14:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 47dbef03566d536fd19fa5a8758a2e48 SHA-1: 7281a56e2a9081d7a1b10b94f3c59267f45c2df9 SHA-256: 676dcc34f258a01b99fd31ac20fb28447a10d8fc6da284ae7338a10a10246068
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by multiple engines, including ClamAV and an ML classifier. It contains a large number of external links, indicating a link farm or redirection mechanism. The presence of PDF_SEO_LINK_FARM heuristic suggests an attempt to generate traffic or distribute content through numerous linked PDFs. The primary attack pattern involves directing users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://maypoin.ru/strik?utm_term=slam+poetry+22+jump+street PDF link annotation
    • http://linza.media/togizugalepar1a6j9.pdfIn PDF document text
    • http://medicinfo.online/tada_kimi_wo_aishiteru_vostfrv0xp0.pdfIn PDF document text
    • http://moshon.space/kinetic_and_potential_energy_questions_and_answers5f2zq.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/ggjaESG/flying_dragon_simulator_spacex.pdfIn PDF document text
    • https://cdn.sqhk.co/dedizajo/fjejhja/color_wheel_spinner_craft.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/hafvXdV/kodidelexarosoj.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/h7hha9U/delicious_food_recipes_for_lunch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421611/normal_5fdf0a789571a.pdfIn PDF document text
    • https://cdn.sqhk.co/vegubefeno/dhdVigc/home_depot_spring_black_friday_2019_flyer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417029/normal_5ff22035a7932.pdfIn PDF document text
    • http://solent.bar/120385944352pf9d.pdfIn PDF document text
    • https://dapadode.weebly.com/uploads/1/3/4/6/134646205/4047591.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_off0000c4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D5 5376 bytes
SHA-256: d52145fc0547991d69db725c2252fd081fb3d8af7e0360efc35cac570767da6b
font_01_sfnt_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 10048 bytes
SHA-256: fc785a2a5a7987cab68cf793feee69b261a3696c317f6897c59cfb27302b1034

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