Malicious PDF — malware analysis report

Static analysis result for SHA-256 676dacb2a3546496…

MALICIOUS

PDF

71.8 KB Created: 2021-02-22 12:07:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1095d0c8f6c9bb8fb267821c0e99636c SHA-1: 4431bbfa5f4aadde0d44cfd4557c0557bf662e8d SHA-256: 676dacb2a354649679b5c76ed44ba1ce4938d9aa22e95cd515b1a43e990e2990
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, with a primary one leading to a URL that appears to be a phishing lure disguised as search results. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded links suggest it functions as a link farm designed to redirect users to potentially harmful content.

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://jottigo.ru/strik?utm_term=do+the+washington+redskins+have+to+change+their+name PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453134/normal_601135f0c361a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445550/normal_5ff1265e6d10a.pdfIn PDF document text
    • http://jezojarugeboz.22web.org/android_mobile_video_recovery_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403141/normal_5fcd56497871a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489240/normal_5ffe79c6a0269.pdfIn PDF document text
    • https://texodixoxi.weebly.com/uploads/1/3/1/8/131857215/kuwonazofuwiru.pdfIn PDF document text
    • https://ziwivebagojub.weebly.com/uploads/1/3/1/8/131871618/d63f78923067e8e.pdfIn PDF document text
    • http://trysol.xyz/miguvovebaxurikepnfhlg.pdfIn PDF document text
    • http://www19216801.site/wurujhkadz.pdfIn PDF document text
    • http://testersairf.xyz/pogromcy_duchow_piosenkao4mo6.pdfIn PDF document text
    • https://xigobiniliw.weebly.com/uploads/1/3/5/2/135298108/powaluzunerubel.pdfIn PDF document text
    • http://mmeueue.space/wheel_of_time_book_14_audiobookez25k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijinisefiregot.rf.gd/76826600227.pdfIn PDF document text
    • http://xaterukojokose.rf.gd/probability_density_function_wikipedia.pdfIn PDF document text
    • http://gewofudi.rf.gd/jbl_cinema_sb200_price.pdfIn PDF document text
    • http://potazerupew.rf.gd/atlassian_jira_tutorial.pdfIn PDF document text
    • http://dimogotewebi.epizy.com/appreciative_inquiry_book.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/boone_and_crockett_score_sheets.pdfIn PDF document text
    • http://bumezemenunaxiv.epizy.com/transformers_dark_of_the_moon_autobots_ds.pdfIn PDF document text
    • http://xidafod.rf.gd/imphal_airport_weather_report.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_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 5536 bytes
SHA-256: 96a8c8fa81930d5600b7b23fc26aa304bc43c045f8997d0c8937852408722f9b
font_01_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 11040 bytes
SHA-256: 70a77e307051d297969baf1451405c4742966c50640cb26b95ddf36c7fc88ea0

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