Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd9b601e01d29a8…

MALICIOUS

PDF

80.1 KB Created: 2021-03-04 17:26:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1fc0e49a6b7e883b7458d5d24335b7b2 SHA-1: 6d21c34ef09d76b02fc3630e299f9e4f676df1a7 SHA-256: efd9b601e01d29a85125c1a409725b34e4d3f7a85de5fa9d1d0b22982ad4b0db
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable domains and are likely part of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, with the 'Pdf.Phishing.Trojan' signature suggesting a phishing or trojanized document. While no scripts were explicitly extracted, the PDF structure and URI heuristics point towards malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=country+with+highest+income+per+person PDF link annotation
    • http://se-mrush.com/how_to_put_voicemail_icon_on_androidtkqnt.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/microbiology_with_diseases_by_taxonomy_5th_edition_free_downloadt9i4m.pdfIn PDF document text
    • http://topsale.pro/90788578661fvtdh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419623/normal_602c0f716c1f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_603766116bca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_603ed60f5d1ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_601837e3a3b08.pdfIn PDF document text
    • http://abistrans.ru/netflix_movies_free_websitesg4d0x.pdfIn PDF document text
    • http://bnl-jobs.com/unicorn_comic_stripzs1ye.pdfIn PDF document text
    • http://pinerapidsrr.com/experimental_design_of_a_controlled_experiment_worksheetmy8rd.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://s3.amazonaws.com/paxuvagal/jojo_siwa_boomerang_video.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_d565ddad5ca243528b04a29d281a4813.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejexe/dirabosixewixukitedo.pdfIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_0003af22dd454333bfef1219a75b28cb.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_8fed0efb5f67461e94f7273554b26e53.pdf?index=trueIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_060aae0c3c124f688e52b6401f382733.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_e9feb65f86f74c2fbcacc57bc99a9bb2.pdf?index=trueIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_3addbfca169d4362945ab4e3c665419d.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_9dfe51f95ec849a591072021ee22a904.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_df822c23681f4239b0eb53603b37875a.pdf?index=trueIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_f038c526bd49415da7f68bfe2145eab2.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_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 5204 bytes
SHA-256: 70dcfe4e80d81e9a61091a2e1bd4144d7f0d583f116acdce5517962fd98b8709
font_01_sfnt_off0000ffab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAB 10888 bytes
SHA-256: bebf65129ca24da0dbd4e8230e755447833a7d5a6a936693d99ec78281e3410e
font_02_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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