Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dcde46d9c8af77…

MALICIOUS

PDF

78.3 KB Created: 2021-05-06 08:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab2060b4a2ead1f1c9b8af80021f7d17 SHA-1: 331b2c689773b3da19cdc3ab4923fdaec2b89c1b SHA-256: 41dcde46d9c8af7704f06330b5e200df781f92848d6e34d93154bd4f9b421c46
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://jumiwimov.ru/strik?utm_term=plato%2527s+republic+sparknotes+book+6
    • https://cdn.sqhk.co/xidupesijij/heMuhvg/logefepunaturivuditodad.pdf
    • http://indital.space/whirlpool_washer_repair_parts_listr3z9n.pdf
    • http://itactical.xyz/legend_of_zelda_links_awakening_walkthrough_bookpdea6.pdf
    • http://romeoplanet.club/63110746087tl6r0.pdf
    • http://usesoda.pro/gomoku_strategy_guideoxwnh.pdf
    • https://cdn.sqhk.co/xinulezebi/egg6jhf/samsung_members_beta.pdf
    • https://dolopexoje.weebly.com/uploads/1/3/1/8/131872138/9294546.pdf
    • https://cdn.sqhk.co/zoribakim/jfAMWhe/1878842108.pdf
    • https://cdn.sqhk.co/suzeboxiwo/Rhiidcr/100_in_1_games_download.pdf
    • http://lnstagram-helping.live/editor_de_presentaciones_electronicas_definicionbu3rf.pdf
    • https://cdn.sqhk.co/melipetoluf/WOjeYge/80s_music_trivia_quiz_and_answers.pdf
    • https://kajibelewori.weebly.com/uploads/1/3/4/3/134307873/vuzolixaxelejuxanubu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://naremijex.epizy.com/diagrama_bimanual_que_es.pdf
    • http://dazatekuzos.epizy.com/court_of_thorns_and_roses_series_book_2.pdf
    • https://uploads.strikinglycdn.com/files/ffae2d3c-436b-4d5d-8875-275a10110caf/howard_miller_grandfather_clock_value.pdf
    • https://uploads.strikinglycdn.com/files/2ca4b603-47a2-4ee4-a39c-53b47cc9e1d0/what_is_a_2.9_gpa_in_uk.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_off0000f432.bin
7dcfef37cedf0ae5d19018da00ea45c512c2d885ec27dcf29ef8a26a3df26a7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 5320 bytes
font_01_sfnt_off0001065c.bin
79e6dfbb930cec64e2b867669eb8fac37866a41ebde16ff9d6f7603c6ed3d911
pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 10976 bytes