Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4603eb8fc39c6b0…

MALICIOUS

PDF

77.7 KB Created: 2021-03-04 01:50:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a45789aa0270eed4f3e45967d8bae77f SHA-1: c56bd25ca061878522cd008181f1410915cd8a33 SHA-256: a4603eb8fc39c6b0ca0b96eead5cafbd6d0f07b72817bb5bda78c9f0ecc4d01e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, one of which, 'https://leonvi.ru/strik?utm_term=edgar+allan+poe+los+crimenes+de+la+calle+morgue+personajes', is flagged as a potential redirector. The document body, though heavily obfuscated, appears to be a lure related to literary content, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=edgar+allan+poe+los+crimenes+de+la+calle+morgue+personajes PDF link annotation
    • http://zizodoroluxonaf.sportsontheweb.net/death_note_episode_7_english_sub_facebook.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/open_in_paintshop_pro.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/the_chase_game_show_cancelled_usa.pdfIn PDF document text
    • http://bivitajuteje.mypressonline.com/dykes_to_watch_out_for_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/niwijadekepusujunimo.pdfIn PDF document text
    • http://badamowafe.onlinewebshop.net/wisagiwa.pdfIn PDF document text
    • http://wivoruremuwun.rf.gd/jujipinefelazo.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/what_clippers_do_professional_dog_groomers_use.pdfIn PDF document text
    • http://sevetise.rf.gd/android_action_rpg_games_offline.pdfIn PDF document text
    • http://xasigidokax.rf.gd/shadowrun_returns_guide_character.pdfIn PDF document text
    • http://vimodamugirad.rf.gd/die_hard_3_movie_script.pdfIn PDF document text
    • http://taxisariwoboduz.epizy.com/72964196386.pdfIn PDF document text
    • http://tafobinememen.epizy.com/building_maintenance_job_description.pdfIn PDF document text
    • http://pavinudoj.epizy.com/46561190053.pdfIn PDF document text
    • http://durunorutap.epizy.com/zuwetuje.pdfIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 5428 bytes
SHA-256: 6b1dfe28380d53531e24426cd67d15f5f69278e517aae42964804f554d82e050
font_01_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 11244 bytes
SHA-256: a7f418277df98837bbb863889894217e01fd2d28a2955b49e135d3865471e7ce

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