Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b237ecebfca563c…

MALICIOUS

PDF

69.9 KB Created: 2020-12-24 22:24:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: af8dc4f6ce5ae67eec347f0585c2989a SHA-1: ea4be618edb85431eafa711f2c25594e7dae9b02 SHA-256: 2b237ecebfca563c3564c748557df7674a4489cf8349367f147ac0e0193d69e1
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The embedded URL `https://traffine.ru/aws?utm_term=avancemos+2+textbook+answers` is the primary indicator of malicious intent. The ML classifier and ClamAV detection strongly support this assessment, classifying the file as malicious and likely a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffine.ru/aws?utm_term=avancemos+2+textbook+answers In PDF document text
    • https://cdn.sqhk.co/wedifedaguju/jeuBhC4/fokurifukirewivegikux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_5fd2ccde285a1.pdfIn PDF document text
    • https://cdn.sqhk.co/lotazoza/O9hgFi6/jelunenipavadebe.pdfIn PDF document text
    • https://cdn.sqhk.co/simirides/gjKghia/background_wallpaper_hd_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/xetorexevapi/54kjiI4/ringtone_rock_music.pdfIn PDF document text
    • https://cdn.sqhk.co/godajaxox/gTMgdja/overdrive_premium_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dobopejig/icuxhfO/tomboy_skins_for_roblox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455403/normal_5fdfce6a89b45.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/muvarelo/97396735464.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/majelimazabuzokuxaferov.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/bike_racing_games_3d.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/78381542406.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/83008079423.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/44793362816.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/katame.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/teacher_guide_science_10.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_off0000c770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC770 5200 bytes
SHA-256: 05200150900a4c01b9c4ad9956d1b14819b568bfcfd0cdcb3bbcc7494fc9df9b
font_01_sfnt_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 10716 bytes
SHA-256: 91568a8dc4158de8bd45da688cac8228c45c97cbd3a195ecb408ff2ce99fb350
font_02_sfnt_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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