Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cad7595127b794…

MALICIOUS

PDF

148.8 KB Created: 2021-04-02 20:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4b9de5f636d57efea4da34bcd57ce8e8 SHA-1: 2e3a604a8056ff4be4ed955d82ee5d89e07947a2 SHA-256: c7cad7595127b794752e996791eaa3c6715d05947173d3ab81612a960c82e281
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to a disposable domain, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a search query, reinforcing the phishing pretext.

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
  • 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://jumiwimov.ru/strik?utm_term=why+is+macbeth+the+shortest+play PDF link annotation
    • http://bebetadiruj.mywebcommunity.org/how_to_update_vizio_e32-c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449417/normal_5fd8171ea8009.pdfIn PDF document text
    • http://makelemeg.mygamesonline.org/basic_multivariable_calculus_marsden_download.pdfIn PDF document text
    • http://gumidaz.medianewsonline.com/how_to_fill_out_a_goal_setting_form.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/montblanc_le_petit_prince_ballpoint_review.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/21595359999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_606698651a8e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5fe7782d981dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378855/normal_5ffccae6502d4.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/from_dusk_till_dawn_movie_download_480p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_5fdb58fe1bd5e.pdfIn PDF document text
    • http://suvonenexazu.mywebcommunity.org/c._s._lewis_screwtape_letters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412909/normal_5ff2c790144a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_740c6b17a8e44569a648e452bb25a48c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2c8c34-813f-4beb-9e2e-42ae06646f52/16224475381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad1137d5-7b56-4d9c-8971-3d313af3bdd5/xamabila.pdfIn PDF document text
    • http://pasofotamuteper.atwebpages.com/53851568702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b52aaf42-fd8c-4f50-95bf-7fd6c19e9c10/what_do_i_use_to_lubricate_my_treadmill.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_2fe81d02425b4e74b4896ef0572279c8.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_631707bad8284d6f9fe4379ec6e56ab8.pdf?index=trueIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_fe4204d165f34864b16b209ac2be405f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5874059-dd6b-4fb6-8dba-6c6634355ca9/vedozifuzoxutijokidarob.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_off0001fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA06 4192 bytes
SHA-256: 50a45d65892e60db1a4c02cc9366a565f6aef52dd2a16c0e3c7f6ce5d7c79459
font_01_sfnt_off000208c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208C4 5428 bytes
SHA-256: 55eda2296f1fa853c8d86ef29ea3022cfbb0111fa79ef837c5370af24ef251d1
font_02_sfnt_off00021b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B18 12556 bytes
SHA-256: 57859b7409ad558b115e856fb90458a9cc6796ef95176d1ea0de37cf0ffb77ab