Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da257295e93535b…

MALICIOUS

PDF

71.9 KB Created: 2021-03-07 03:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0245b41b6c81626db45b10f7a57c72f3 SHA-1: 4ec7524f1cf686f34fccb311679615275732839d SHA-256: 6da257295e93535b16dcc2f307b2ebf237590190eb32cb78a9ba02e3c02a588c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=paper+folding+bookshelf PDF link annotation
    • https://cdn.sqhk.co/wujakegu/jdhaMhf/nagamu.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/lEehfhe/swordigo_worlds_end_keep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450138/normal_600474cf8b76b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426075/normal_601bf95d9a420.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377902/normal_5ffbd65def75a.pdfIn PDF document text
    • https://cdn.sqhk.co/pixukinoma/aRhiGij/what_do_crackles_in_your_lungs_mean.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/oracle_sql_substr_after_last_character.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_601b8a45d9d81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410431/normal_600cb9f8ae5bb.pdfIn PDF document text
    • https://cdn.sqhk.co/soredepel/XhbsOie/8079957672.pdfIn PDF document text
    • http://gomigapujasep.sportsontheweb.net/unidad_4_leccion_1_avancemos_2_answers.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://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_97dbcaf21bf64e90b3b3c4deb6f1b3e9.pdf?index=trueIn PDF document text
    • http://forilojemani.epizy.com/lavuluvibalesemeret.pdfIn PDF document text
    • http://wisunomimat.epizy.com/swearing_emoji_android.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/beethoven_5th_symphony_sheet_music_easy.pdfIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_8f5abc0a5a13431abe20e02202e64aa2.pdf?index=trueIn PDF document text
    • http://nefaped.epizy.com/building_covalent_molecules_worksheet.pdfIn PDF document text
    • http://zekarevuwo.epizy.com/online_autocad_jobs_work_home_in_pakistan.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_99fcd75c358a49679f00bbe6b1a36e91.pdf?index=trueIn PDF document text
    • http://rowisumemosil.rf.gd/fujopututa.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_2fc6385e0f0346c48ddf5af4e1862675.pdf?index=trueIn PDF document text
    • http://rukosivujuxu.atwebpages.com/rolewotafetisabixovigiwif.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_off0000cf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 5216 bytes
SHA-256: d76fe333c4581dcf2f11e7124e2e89c1a51fad4eeee49ccea0c9476bbd0a2a2f
font_01_sfnt_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 10248 bytes
SHA-256: d8ab0676ed4d667f3315e531322974c9fb1e039c6ae3db489880b2e609f2dc5c
font_02_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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