Malicious PDF — malware analysis report

Static analysis result for SHA-256 b425c30b74cb58d1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 01:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f98a623808f68d2df03774d4f292e488 SHA-1: a486ba43e51402d78f4539cbbee0a976b15f6ee2 SHA-256: b425c30b74cb58d1df33b1f2c7c98cae238e71208113e46f189632f6f23870a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.annaleehuber.com/content_files/file/10349926798.pdf In PDF document text
    • https://prtl.pl/userfiles/file/20205589238.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/memusufafojilofubudikema.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/kasafoxabapiluxonawisixik.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/gexegowozonewovusud.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/rerevogodeputotudi.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/19526499839.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/16071822195.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/xipavugosuwivenazovitiz.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/13257364346.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/57972901949.pdfIn PDF document text
    • https://kildevangen.dk/files/wezadevoxabetibonodut.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/76269359986.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/30229900696.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/49945728077.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/77020779811.pdfIn PDF document text
    • https://csodamalom.hu/files/files/62784807174.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c11196e1452896dd4413fe61e8bfb9f1/jevozovi.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/40531118881.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/8235233230.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/botazabemuji.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/59265583117.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/95015614680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=snapdragon+732g+benchmarkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 11204 bytes
SHA-256: 0192a6e2cd33712274e110659b509cea0ef8d66f33c6f93698852a5e30ec21d7
font_02_sfnt_off00011142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11142 17368 bytes
SHA-256: 6363f3385a30443e175adb833769f82acf151aa76217f2799b76c88205aa478a

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