Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef778cf33cf6d94e…

MALICIOUS

PDF

99.2 KB Created: 2021-04-01 15:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c2c9c7a159a8cf25cd61e7ef01683c0 SHA-1: 1d6ca6027e74552624bd02d410b0e0b4b417234f SHA-256: ef778cf33cf6d94ed7c4b74ed08bff9eb75294c0b64832799b2344e37338b880
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are generated SEO-style links pointing to other PDFs. The document body text is garbled, but the presence of "Nj transit child fares" suggests a lure. The heuristic PDF_SEO_LINK_FARM indicates a link farm, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious.

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://dafemum.ru/strik?utm_term=nj+transit+child+fares
    • https://cdn.sqhk.co/timugulirebu/Gihz1WA/oscar_health_insurance_florida_providers.pdf
    • https://cdn.sqhk.co/metexemoraga/SBDja5h/adventure_story_2_all_bosses.pdf
    • https://cdn.sqhk.co/xumobopore/ChcigFg/idle_human_app_store.pdf
    • https://cdn.sqhk.co/tosobulig/iajfKjd/21353429048.pdf
    • https://cdn.sqhk.co/lizuloka/oidUxV4/kiroxejiduxotewob.pdf
    • https://cdn.sqhk.co/nupozifulija/gHhc0he/how_to_draw_sulley_from_monsters_inc_easy.pdf
    • https://cdn.sqhk.co/sepexapubu/jaAgd4I/art_brush_normal_font.pdf
    • https://cdn.sqhk.co/duwefetufe/aYjbjfJ/zatorepij.pdf
    • https://cdn.sqhk.co/kubabulukod/fkLK8S2/gun_shoot_war_game_download_malavida.pdf
    • https://cdn.sqhk.co/jawefujivi/iiihEhe/anime_wallpaper_mobile_4k.pdf
    • https://cdn.sqhk.co/ruzudulo/hfa5Lgf/53034298302.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vonolukover.epizy.com/xagudinedod.pdf
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_ca6742a429fc46afae602d7bf6798b44.pdf?index=true
    • http://vemudozuxara.epizy.com/87967617935.pdf
    • https://s3.amazonaws.com/nafamaragisek/believer_karaoke_mp4.pdf
    • https://s3.amazonaws.com/fujadabez/how_to_use_self_cleaning_function_on_ge_profile_oven.pdf
    • https://s3.amazonaws.com/negonanopix/lasko_fan__space_heater_combo_tower_42_inch_silver_fh500.pdf
    • https://s3.amazonaws.com/mawesenasijoser/home_buying_for_dummies_barnes_and_noble.pdf
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_bd87fa590eaf4ed1a964562b9cda11bd.pdf?index=true
    • https://s3.amazonaws.com/jawusawar/29601026362.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013128.bin
15207f24a225819273b5fc3e53f6135ea9bc3eb62b35daae15f5c9346bba9cb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13128 5152 bytes
font_01_sfnt_off000142ae.bin
cb2e20fb7f999173cfe13e4869df0ff581e425e50c2dbf367af0fb467ad84ab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142AE 11488 bytes
font_02_sfnt_off00016a10.bin
68eef4b610644b6a98f668349b58b424e8310755c20c018328a8321db0e17a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A10 16232 bytes

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