Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a701e06cb2f8b1…

MALICIOUS

PDF

73.9 KB Created: 2021-04-25 22:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: eb2b3b788604cee2664564ea49d113a4 SHA-1: cef51a713f0ca40baee60ceecf4293c2cd069586 SHA-256: 38a701e06cb2f8b1193c8419845793bfe22e7af0d0efaffa36edb4525771622b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains text related to 'Clasificacion de los costos de calidad', which is likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=clasificacion+de+los+costos+de+calidad PDF link annotation
    • https://cdn.sqhk.co/seseniluvus/iQjjHje/setup_free_netflix_t_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/zimofuzam/h1EYjfJ/best_90s_pop_songs_playlist.pdfIn PDF document text
    • http://firstreadersclub.com/91389924841qaszc.pdfIn PDF document text
    • http://udilische.club/kesosamiwisotifogufomtoeui.pdfIn PDF document text
    • http://vinnipoh.fun/bevacizumab_irinotecan_glioblastoma_multiformepaxdf.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/giFjdKe/dark_souls_2_lucatiel_quest_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/nosisatoved/hmTqSgg/balega_socks_amazon_uk.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/kabipaletavakuux560.pdfIn PDF document text
    • http://romeital.space/41047046230b0m7p.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/3kohbtt/battle_arena_toshinden_1_sofia.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/gedwSIM/optical_illusion_in_photography.pdfIn PDF document text
    • https://cdn.sqhk.co/tezuzerise/fjaghBV/arcade_games_all_in_one.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/BgfJNic/pet_shop_boys_opportunities_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/Oje3ih5/dune_movie_2020_feyd.pdfIn PDF document text
    • http://uber-global.com/stylesheet_class_tagpzj7b.pdfIn PDF document text
    • http://dithetsen.xyz/wiwaforisimgmoi.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/aPjigds/audio_editor_mixer_software_free.pdfIn PDF document text
    • http://jezuxomedoz.iblogger.org/44755952239.pdfIn PDF document text
    • http://cookwellbakewell.com/priya_bhavani_shankar_imageh8uw1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulawev.epizy.com/letter_of_resignation_template_word_2007.pdfIn PDF document text
    • http://xalajagixoba.epizy.com/national_cash_register_repair.pdfIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_cc28e82c47da4597abf0925af52bd010.pdf?index=trueIn PDF document text
    • http://vugixemavofagen.epizy.com/73889513761.pdfIn PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_3a22775bfb544f9c99054fe73e51bf58.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_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 4824 bytes
SHA-256: 5943b73661663a2dc6fca7798dc2a6f44ec09db8c7ad09020bf097d091e4df09
font_01_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 11076 bytes
SHA-256: 7f6146b0b95a42f25d9535f2e76dae27744b159e8d7e69d97349dbf30bacb381