Malicious PDF — malware analysis report

Static analysis result for SHA-256 754325d37cb4cf2c…

MALICIOUS

PDF

76.4 KB Created: 2021-04-02 00:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 227bad809a1e7e24c9c15035532a60cf SHA-1: 620d80fd8009f41ae645c36473a57f548b7e34d4 SHA-256: 754325d37cb4cf2c81d1cc99de44c99d5ca2d09919415f30ae2782ed134d17bf
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain text related to PDF manipulation, likely as a lure to disguise the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=comment+joindre+plusieurs+pdf+en+1+seul In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_60179e066dbae.pdfIn PDF document text
    • https://cdn.sqhk.co/gixekoji/iavhdZB/homescapes_super_hard_levels_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379473/normal_5ff6a854ce421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414166/normal_601217aad3379.pdfIn PDF document text
    • https://cdn.sqhk.co/setupemup/djceps1/world_road_racing_championships_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/bZjhb5s/mp3_player_online_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5fd2cf858a578.pdfIn PDF document text
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/e17a51d7f3.pdfIn PDF document text
    • https://wulapoledonuker.weebly.com/uploads/1/3/2/6/132695240/cc6ab640.pdfIn PDF document text
    • https://cdn.sqhk.co/vutenugade/hgAwjLs/hero_rescue_level_223_impossible.pdfIn PDF document text
    • https://cdn.sqhk.co/pogadidotilu/jiign3w/puxudek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_605959ee119b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd95b77-6cf2-48a1-9244-54ee80f8ea63/tusegafapasuzaxexus.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/81217819253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4790524-f612-45e0-8f8b-31b5190d7754/71452007082.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/backseat_drivers_license_template.pdfIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_0d235dbbddb240c48245c36b227f0c91.pdf?index=trueIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_a1ab6cbc782248bcbde4cf45bb88e536.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/pura_vida_sticker_request_form.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_fdd7f3058096469c861ada8524e89e29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9c73f9d-6819-4544-b691-bbca3d325716/la_biblia_reina_valera_hablada_libro_de_genesis.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/sat_math_prep_questions.pdfIn PDF document text
    • https://16dc6c2a-32e3-4a69-9eea-5b59d93654f8.filesusr.com/ugd/176c29_43ced794b7174a859f03cdb380965302.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_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 5012 bytes
SHA-256: ec9e51c7f787d3cd2fd757f6783d3bf2a6a338dd78ce1d921b9627c4b5327b61
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 11908 bytes
SHA-256: a0fad8006d767ec9ce346910ebe5123dace38ae16fa0e29c3ee424cff7149669