Malicious PDF — malware analysis report

Static analysis result for SHA-256 6213583ba3005d04…

MALICIOUS

PDF

74.3 KB Created: 2021-04-05 19:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0b8a84de543e7108176996da88f589ce SHA-1: 28b4be98b245aa17c08bd3834fbfff752705eb1d SHA-256: 6213583ba3005d04d3cca3b6b7c647b4ff4ca8e741d7595a901e375e253127c1
186 Risk Score

Malware Insights

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

This PDF document contains a significant number of external links, indicative of a link farm or SEO manipulation tactic. The ML classifier and ClamAV heuristic strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs point to various domains, some of which are hosted on disposable infrastructure, further increasing suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=how+to+remagnetize+a+brushless+generator PDF link annotation
    • https://cdn.sqhk.co/ximepadogi/gdVBhiO/csgo_bomb_defuse_sound_command.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457272/normal_6003f84d985f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481834/normal_5ff9a8bec437b.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/dhfibig/87477829796.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/u1Aide1/design_my_living_room_app_free.pdfIn PDF document text
    • https://sonefuvik.weebly.com/uploads/1/3/4/3/134325549/juliweg.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/jhhgPge/freeze_credit_experian_phone_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_60346fa3b6cf0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484399/normal_5ff620f7d043c.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/Rjdgdia/spaceflight_simulator_1._5_mod_download.pdfIn PDF document text
    • https://bigififipajug.weebly.com/uploads/1/3/4/7/134709095/658013.pdfIn PDF document text
    • http://livelaj.iblogger.org/dodie_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420239/normal_5fe2d9d691219.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/eiijaIm/bollywood_movies_2013_hd_free.pdfIn PDF document text
    • http://dusefibesix.iblogger.org/meconium_aspiration_syndrome.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/Egifz6b/99840963877.pdfIn PDF document text
    • http://velavedi.iblogger.org/69694547377.pdfIn PDF document text
    • https://cdn.sqhk.co/bujerinalo/o8ocWUo/process_improvement_template_ppt.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
    • http://lisotabisalak.epizy.com/baghban_movie_song_songspk.pdfIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_d41441351a0f4b5fb20e593d4cf7cb05.pdf?index=trueIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_d6bef46d7fae40b69edb180843065b3a.pdf?index=trueIn PDF document text
    • https://2bb9e989-9ce9-409f-aa8a-839f2ea8d3bf.filesusr.com/ugd/9f8cc2_019b6f6870454c11a30bf59bdb6904ef.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_c45279f2b93340e5931b7b4d33928ad3.pdf?index=trueIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_9acb487ebe4c4426ba507dd74a19cb5d.pdf?index=trueIn PDF document text
    • http://serinuzosazojup.epizy.com/data_retention_policy_template_gdpr_free.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 5224 bytes
SHA-256: 2465ec7cb60da20e7ab137c5d26da74f54884b48e29b960d06c3e2240a4f2743
font_01_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 10104 bytes
SHA-256: 6e4f488c11fe9e0b95ddc9cf35fe2f1cf0f06ed9cf07ab63b6efac6915242c74
font_02_sfnt_off00010e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e