Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff49f56544d8042…

MALICIOUS

PDF

88.9 KB Created: 2021-03-05 04:34:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c75bf9dfad8b64c8bc7f88f725aba447 SHA-1: bd9b25c1a10c453623d59e54b17d84f0fe87779f SHA-256: eff49f56544d8042c207fc3a88d01c541d4273efcf77e0d4cd68691647b15164
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The embedded URLs and the heuristic findings strongly suggest this document is part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-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://ponafet.ru/123?utm_term=frankenstein+1818+text+penguin+classics
    • https://zevexeduj.weebly.com/uploads/1/3/0/8/130874566/7542967.pdf
    • https://rusolozotiwar.weebly.com/uploads/1/3/5/9/135992237/3415937.pdf
    • https://jetisinodab.weebly.com/uploads/1/3/5/3/135335938/4303366.pdf
    • http://bidizujimon.getenjoyment.net/44029584069.pdf
    • https://cdn.sqhk.co/mibemofega/xOii4jh/pokemon_emerald_emulator_master_ball_cheat.pdf
    • https://cdn.sqhk.co/nazutupim/Ljegi7x/interstellar_complete_soundtrack_download.pdf
    • https://cdn.sqhk.co/jenojigise/bG0gchd/weketizunosenaz.pdf
    • https://wetenonuvodipu.weebly.com/uploads/1/3/5/3/135321676/kukexo.pdf
    • http://vurujupafowutox.mypressonline.com/string_theory_david_foster_wallace_review.pdf
    • http://xufelaketodo.getenjoyment.net/how_old_is_my_ruud_gas_water_heater.pdf
    • http://sevibifodome.getenjoyment.net/how_to_do_a_hard_return_in_indesign.pdf
    • https://dexajaxalujum.weebly.com/uploads/1/3/1/8/131857565/duzulez_newebakajavemi_womifidiwesud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_b1bdfacc478e4bbb8def354363638568.pdf?index=true
    • https://uploads.strikinglycdn.com/files/602cf5d8-af98-49d0-80a2-36658295de7a/is_pokemon_better_on_switch_or_switch_lite.pdf
    • https://uploads.strikinglycdn.com/files/8003e20c-ba97-45c9-ba91-929590fdda5b/how_to_replace_whirlpool_refrigerator_water_filter_3.pdf
    • https://uploads.strikinglycdn.com/files/cd8c7eb4-1e48-415b-83c0-f9de68fe705d/what_is_work_measurement_and_method_study.pdf
    • http://xifeloj.onlinewebshop.net/the_night_before_christmas_movie_actors.pdf
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_e6880c34fadb41e3a8581c624db3c472.pdf?index=true
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_9e00ddb663a44c2990656ff6f0fc3327.pdf?index=true
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_108c27db56d241eda7673f2929c5c1a9.pdf?index=true
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_bc2dc98eea9149beb456cb70aad520f8.pdf?index=true
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111f1.bin
41cb146a9d2c3f67067679676b7b7932bf46eb78e58b31a7aa77ed2a2b0344f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F1 5204 bytes
font_01_sfnt_off000123bc.bin
9dc53b9cd61e9658d81bd99d60d049c785ec439779125b5e256605627509bf56
pdf-font-stream PDF embedded font (sfnt) at offset 0x123BC 10528 bytes
font_02_sfnt_off000147cc.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x147CC 4324 bytes