Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f94c5d20739ef7f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-24 10:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fff0f9dabd6392e9d52c5eb64eef582 SHA-1: 44e85780c1163bb5bae86d1ab76c8c1ca686250d SHA-256: 1f94c5d20739ef7fbf7028c75382b95a86651125d4c585fc2b23a363f12e5b16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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 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://smidgel.ru/uplcv?utm_term=battery+stress+test+android
    • http://ducthanggroup.com/webroot/img/files/fizebes.pdf
    • http://atek-ent.com/upload/file/25775292196.pdf
    • https://spvi.cn/filespath/files/20210923135530.pdf
    • http://skomi.ru/img/files/file/71261410114.pdf
    • http://rowerowaszkola.pl/imgturysta/files/63824256570.pdf
    • http://doremimarlikinsaat.com/userfiles/file/63585359860.pdf
    • http://studiecarriere.it/uploads/file/nenajamexovubipare.pdf
    • https://onlinendttraining.net/files/93575692358.pdf
    • http://alexdisinfestazioni.com/userfiles/files/jujerevoradojijuzefa.pdf
    • http://leaguengn.com/userfiles/file///dogiwod.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/44801458135.pdf
    • https://247christianity.org/fckeditor/userfiles/file/965635231201630720157.pdf
    • http://tribo.kz/userfiles/File/31925166756.pdf
    • http://mskgroup-spb.ru/upload/file/90474443788.pdf
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/zivopivepusopona.pdf
    • http://czdashan.cn/uploadfile/file/2021091000554073499.pdf
    • http://casinodanmarkjackpot.dk/userfiles/file/zebuxalijagaritorupi.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb04df4f79b97391b8eec4e5bd0c536f/75641930835.pdf
    • http://sp3siemianowice.pl/userFiles/files/61389545353.pdf
    • http://eraldocomo.it/userfiles/files/likujapis.pdf
    • https://sgicorp.com/userfiles/files/zenalozemopuvuwufomomi.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614111ab80427---6491982546.pdf
    • https://croatia-flyfishing.com/files/28304985561.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/86747895150.pdf
    • http://yusungchart.com/userData/board/file/99190159247.pdf
    • https://tasleemdubai.com/userfiles/files/68505885107.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc7.bin
0abb6fc4a6988880e945efb7b65c96a681905288f5fee04830aafa7a89e20cbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 10360 bytes
font_01_sfnt_off0000f35f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 16792 bytes
font_02_sfnt_off00010b71.bin
5cbabc80eef41333a159f89cd555c4037785cdbb58ba84ebf779245c51732beb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 17020 bytes

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