Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf907974ee1a29b8…

MALICIOUS

PDF

79.4 KB Created: 2021-05-13 21:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: efa5666abba92a4a072e93705645ee70 SHA-1: af029bf7a0d90778aed1e0de16d78b9622f1def9 SHA-256: bf907974ee1a29b8afcb1a1b708cdb187c4161addae305dbcb18a2d527c46b6b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one pointing to 'seumenha.ru' which appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to cooking recipes, likely to disguise the malicious intent of downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wb?keyword=how%20to%20cook%20a%20honey%20glazed%20spiral%20ham PDF link annotation
    • http://tezuveripoxub.mypressonline.com/nacionalismo_revolucionario_mexicano.pdfIn PDF document text
    • http://wopudidadufi.22web.org/mafikova.pdfIn PDF document text
    • http://hh666o.site/bezalitijerugd2rvq.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/2014_mazda_3_gt_owners_manual.pdfIn PDF document text
    • http://pristav.pro/free_games_dx_ball_5frlsg.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/651d5b95-f315-4528-9740-1434eae6239f/divergent_movie_free_download_in_hindi.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_68370ad643c54c718d40fb9ec321c43b.pdf?index=trueIn PDF document text
    • http://medowopevafosi.rf.gd/chameleon_color_adapting_live_wallpaper_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/clinical_practice_guidelines_diabetes_philippines.pdfIn PDF document text
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_e44eba8a2cde4157bc26cb51cdecf5b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pigolo/jisiwukexolizolosigifap.pdfIn PDF document text
    • http://nidemavaguwagev.rf.gd/register_reports_cubecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d7bb36-9143-426e-910c-cb721b6f4141/kulepomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b2e4a9-3fc6-46f7-834a-3d0a06a5ebc6/how_does_bitcoin_work_youtube.pdfIn PDF document text
    • http://petikeb.rf.gd/banana_boat_sport_performance_spray_review.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_f18097a9866f4928a3719e5d116cfecc.pdf?index=trueIn PDF document text
    • https://ba5d4ca7-777b-4ff7-855d-60fc8da7b8b2.filesusr.com/ugd/29a726_9777c89158df4c80be46554cf011c025.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/fijazago.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 5756 bytes
SHA-256: 74b1581bdeb66060936879caf3580cd918144198fe81ae4bbf4c792e02e082dd
font_01_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 11656 bytes
SHA-256: 0c4ab1963c64a48d7e6026d3eb193ba42980a547fd6efd7f195d02b3a6d88040

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