Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dca662d51934f59…

MALICIOUS

PDF

72.9 KB Created: 2021-02-12 07:24:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f25d728d0afb780cb3a2aa2bafb722a4 SHA-1: b8cd4488f3e06e5f3c7f95475a4657a47e3d8a91 SHA-256: 5dca662d51934f59f4813ed98d6069eca533cacda8bb2581d7cabcda772451a9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to exploit users through deceptive content, likely leading to further compromise.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=rain+world+yellow+guide
    • https://cdn.sqhk.co/xenudipu/ahhicTU/dynamons_world_game_mod_apk.pdf
    • https://cdn.sqhk.co/bulixanejad/jjaPsAj/xezunu.pdf
    • http://vannabanyavsedela.xyz/how_do_u_say_pencil_pouch_in_spanisha2k8o.pdf
    • https://cdn.sqhk.co/jisaside/ahahagg/tikojuzazevew.pdf
    • https://cdn.sqhk.co/fulaxanew/iihbagc/rufaval.pdf
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/9770992.pdf
    • https://cdn.sqhk.co/gulanuwe/hljdgga/sport_club_manager_software.pdf
    • https://cdn.sqhk.co/bogulevim/hcnMgfa/shattered_pixel_dungeon_mage_tips.pdf
    • https://cdn.sqhk.co/ravawiku/0jjfgjV/muwon.pdf
    • https://cdn.sqhk.co/zojixemem/cjipWoi/55162341173.pdf
    • https://cdn.sqhk.co/nopavoboriru/ahiggca/wedding_makeover_salon_games.pdf
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/8102893.pdf
    • https://cdn.sqhk.co/jezuleku/jUcicKq/drifting_lada_vaz_car_drift_racing.pdf
    • https://cdn.sqhk.co/sileluzorupo/gij8hcu/stilts_marco_island_menu_happy_hour.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tuxexi/77462150999.pdf
    • https://s3.amazonaws.com/nevovumowa/13348048082.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_off0000e2d0.bin
83f35bdb7264753616ac73c7f7dad8bb4baa76eab5d8701449e7709699b4cd1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 5016 bytes
font_01_sfnt_off0000f40a.bin
9b6acb6bc16b5def471d8d93bd0cdb53e39d3ac4226e14f576724115cbb75ae5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 10184 bytes