Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0884c3579b920e6…

MALICIOUS

PDF

83.9 KB Created: 2021-09-24 09:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 421149eef30968c4bac2486118620eb2 SHA-1: 2b075243ddc612caaca8195a88c94d24254f944f SHA-256: c0884c3579b920e6b29bfb3799d1d837c08bf615e7a32c8ad1d3a574613069d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests the PDF's primary function is to redirect users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://emekyesiltepe.net/images_upload/files/30365639098.pdf
    • http://abpaluso.com/upload/file/wukefavojiwavelomow.pdf
    • http://staceyasp.com/UserFiles/file/sojawotokavabewowo.pdf
    • https://chowdhurytourism.com/ckfinder/userfiles/files/22140010997.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/116063084.pdf
    • http://lycee-elm.com/userfiles/file/wefak.pdf
    • http://sibinetweek.ru/userfiles/file/9614896784.pdf
    • http://lokalizacja-gps.pl/userfiles/file/51271372515.pdf
    • http://toyotacri.com/userfiles/files/45631074495.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135e2fc490a3---vupimoguxuzodugudowato.pdf
    • https://papiratisk.cz/soubory/zinolemamumabolapevu.pdf
    • http://dream-mebel.com/pic/file/toxikoke.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6b5104365f2a109953054d1a8a36a888/70546128111.pdf
    • http://tryinvest.eu/userfiles/files/97697851707.pdf
    • https://fitness-base.tw/uploads/files/202109231406099616.pdf
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/negip.pdf
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/71587107956.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/56363676933.pdf
    • https://danfort.lv/userfiles/file/13862646177.pdf
    • http://vaonhaphatphap.com/images/uploads/files/nasexanofitiri.pdf
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/21625932957.pdf
    • http://velapower.com/glwh/UploadFile/file/2021090703325873499.pdf
    • http://softtox.pl/new/userfiles/file/83701212194.pdf
    • http://fourfoods.com/images/files/99732707065.pdf
    • http://duef.ru/public/file/wulumezelekide.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=stick+z+super+dragon+fight+mod+apk
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 16792 bytes
font_01_sfnt_off0000e28a.bin
de74d7cddcf479278b8b0cf8295d5ef9928bd3ee054a2c385df84f69d53a4d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 16680 bytes
font_02_sfnt_off0000fa3b.bin
7ca20ed0d8960b4444b799aa8a275c6b6d2a551812e9a2a0df4de7bf851c2e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 17420 bytes
font_03_sfnt_off00012754.bin
dbbb718893b5133d8a2bb4d33d8e2441e33d2a25f9ff03e440e90eb7cb047dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12754 11348 bytes

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