Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edec0a177a1d37b…

MALICIOUS

PDF

92.7 KB Created: 2021-05-17 09:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 45b128fcf29ddd222c47085cae531cf8 SHA-1: 1b8d4fbba607d927ffc27f794f4cdc80016e0776 SHA-256: 5edec0a177a1d37bae083b273d50c78e3f5cbb673afddabe8ffe804d6a2e14cc
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xezojetit.ru/strik?utm_term=casio+g+shock+ga+100+original PDF link annotation
    • https://cdn.sqhk.co/kekelivig/hehi6NU/iphone_browser_bottom_bar_height.pdfIn PDF document text
    • https://cdn.sqhk.co/vilosezuj/hhjjihg/23676054183.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/gtzEb0u/online_pc_games_to_play_with_controller.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/cxthdgc/geopark_odsherred_cykellob_rute.pdfIn PDF document text
    • https://cdn.sqhk.co/xetokive/iehiTif/minecraft_mods_mutant_creatures_1._7_10_download.pdfIn PDF document text
    • https://gofexuzadefedim.weebly.com/uploads/1/3/4/3/134306088/dubuxizuju.pdfIn PDF document text
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/ledabogizarufuz.pdfIn PDF document text
    • https://cdn.sqhk.co/dufubimaru/MPTgdha/ball_spiral_jars_28_oz.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/hjAgdyW/96782382504.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/Nvqibjb/misiones_del_pase_elite_free_fire_septiembre_2020.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/98097dba57.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/ZThegiB/34766158618.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/dJuhh9F/84741675469.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/eM9PFhb/gold_mountain_golf_course_restaurant.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/ezhcEXf/wapamasexozejekexexasib.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/cvJhjje/96397378525.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_6842c4d107bc4e72a9d93b0816d7e3bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e769b178-776c-4128-b748-2f07e58eeb72/47827288086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db1b870-56e9-4f8f-b02d-74aa69dc8f32/xapubogomisudoduwirod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9de532f9-df1d-4c36-bdb6-c175f94296d6/48924979714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28e8034-7e68-4f5d-9c0e-74c78863ac85/sofiraximuvofuteri.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_8ea3196f78904278bf9f4c9cefe5f9cb.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_5d748a00e12c4a5dbf7f2dd3eb2c61db.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 5224 bytes
SHA-256: f04b537b60fff0d0cffa9cb54cf8fc18bae313a05173c428ae03fd6b031c9fa3
font_01_sfnt_off000138ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EA 13480 bytes
SHA-256: ecaf58bc1e76d649999da4a081ec80aaac5dcd37e45e3edb137be5d563e95da5