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) First seen: 2026-06-04
MD5: 8c2c9c7a159a8cf25cd61e7ef01683c0 SHA-1: 1d6ca6027e74552624bd02d410b0e0b4b417234f SHA-256: ef778cf33cf6d94ed7c4b74ed08bff9eb75294c0b64832799b2344e37338b880
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as malicious redirectors or part of link farms. The heuristic firings indicate that this PDF is designed to redirect users to potentially harmful content, likely for phishing or malware distribution. The presence of multiple SEO-themed links suggests an attempt to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 In PDF document text
    • https://cdn.sqhk.co/timugulirebu/Gihz1WA/oscar_health_insurance_florida_providers.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/SBDja5h/adventure_story_2_all_bosses.pdfIn PDF document text
    • https://cdn.sqhk.co/xumobopore/ChcigFg/idle_human_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/iajfKjd/21353429048.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/believer_karaoke_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuloka/oidUxV4/kiroxejiduxotewob.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/how_to_use_self_cleaning_function_on_ge_profile_oven.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/gHhc0he/how_to_draw_sulley_from_monsters_inc_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/sepexapubu/jaAgd4I/art_brush_normal_font.pdfIn PDF document text
    • https://cdn.sqhk.co/duwefetufe/aYjbjfJ/zatorepij.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/lasko_fan__space_heater_combo_tower_42_inch_silver_fh500.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/home_buying_for_dummies_barnes_and_noble.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/fkLK8S2/gun_shoot_war_game_download_malavida.pdfIn PDF document text
    • https://cdn.sqhk.co/jawefujivi/iiihEhe/anime_wallpaper_mobile_4k.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzudulo/hfa5Lgf/53034298302.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/29601026362.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonolukover.epizy.com/xagudinedod.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_ca6742a429fc46afae602d7bf6798b44.pdf?index=trueIn PDF document text
    • http://vemudozuxara.epizy.com/87967617935.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_bd87fa590eaf4ed1a964562b9cda11bd.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13128 5152 bytes
SHA-256: 15207f24a225819273b5fc3e53f6135ea9bc3eb62b35daae15f5c9346bba9cb8
font_01_sfnt_off000142ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AE 11488 bytes
SHA-256: cb2e20fb7f999173cfe13e4869df0ff581e425e50c2dbf367af0fb467ad84ab2
font_02_sfnt_off00016a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A10 16232 bytes
SHA-256: 68eef4b610644b6a98f668349b58b424e8310755c20c018328a8321db0e17a89