Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ec129cd8d9bd12…

MALICIOUS

PDF

72.2 KB Created: 2021-03-26 10:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 46b0217c1a5cb8d0e5f2e7aa4a0d91fe SHA-1: aec378460383001b7f0a30b53b8b9d7372fcc0ef SHA-256: d1ec129cd8d9bd124e1ee8f2aea0cc520fecc98514751ee2ab5cad5f521f901b
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by both ML classification and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. One of the primary URLs, https://soxebez.ru/award?keyword=bunga+belimbing+wuluh+pdf, is directly associated with this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soxebez.ru/award?keyword=bunga+belimbing+wuluh+pdf PDF link annotation
    • https://cdn.sqhk.co/nexasolonit/ijVZSUn/kung_fury_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/j5iaSib/wufaninit.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/cjgNicC/vitamin_d3_dosage_for_copd.pdfIn PDF document text
    • http://yesnutural.space/does_shakeology_make_you_lose_weightb02ws.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/ihXXEhf/25010087586.pdfIn PDF document text
    • http://dorightpress.com/rixurononalelunakulotunij2tb9.pdfIn PDF document text
    • https://cdn.sqhk.co/zapevexuvot/LgjMhhY/fireman_costume_toddler_girl.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/general_mental_ability_and_reasoning_syllabus.pdfIn PDF document text
    • https://cdn.sqhk.co/wofutajo/nia4jhd/voguwoxizujef.pdfIn PDF document text
    • http://feelslike35.com/does_tea_give_you_a_flat_stomachk5uu2.pdfIn PDF document text
    • http://specrazreshenie.com/nutrition_care_plan_for_anorexia8vbk8.pdfIn PDF document text
    • http://rubisteq.online/docker_compose_commands_cheat_sheetyc40a.pdfIn PDF document text
    • http://dimax-matrasy.ru/bagas31_pes_2020rmd9t.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/SgikjhG/music_inclusion_coalition.pdfIn PDF document text
    • http://fusekimutoxi.sportsontheweb.net/apple_phytochemicals_and_their_health_benefits.pdfIn PDF document text
    • http://1green.space/bivusufaloxuvacujv.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/cigJVWd/rocket_ball_soccer_league_2020_new_football_games.pdfIn PDF document text
    • http://dkshlyap.ru/nekejidiminobobiwogodokafy01i9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_bc28a9eef26a4a9eb52d64d561942c64.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_928c09f9003a4e0b94fcce2296b54018.pdf?index=trueIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_63a4389b2ca64c46b2d35e0d812f147f.pdf?index=trueIn PDF document text
    • https://ecc4b077-82d2-4cf1-ad45-1e482560a890.filesusr.com/ugd/5d7ac5_9831886e734f4ffca99b6bf3e8656ef9.pdf?index=trueIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_da125629df6646b9a5024b74e2dd65ab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 5152 bytes
SHA-256: 8cb6c1b9352d220f9ec8840c30f4ebdd2ca63cff5a5a0f8d67262f75b5b42ca9
font_01_sfnt_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 10416 bytes
SHA-256: 5e5d75b8e22a379ff449a01e335d149732745ab576d9da199b0c748927b0ddf3
font_02_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c