Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa622f9489848f0…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 09:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c9b4b6f6d69870be2b79d142c01470a SHA-1: 95e429cac9ba25d78acea26d30c29c3e52979589 SHA-256: cfa622f9489848f013e3cfeab58f2968902f3d350fcb609779a4775e3ad2e131
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the URLs indicate an attempt to lure users to download or access malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://synerhu.ru/uplcv?utm_term=download+bowmaster+mod+apk PDF link annotation
    • http://www.egymast-segito.hu/uploaded/fck/file/68856935781.pdfIn PDF document text
    • https://upaspor.com/resimler/files/surivifax.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/19164110666.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/25297149250.pdfIn PDF document text
    • https://eklyps.net/images/file/12267339695.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/jupiwaritorezafaj.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4b1ea22cf---lapajejojo.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/tojorasixuxufubarejiw.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/77746079809.pdfIn PDF document text
    • http://4bx.pl/public/file/38659689305.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/virixudigijesufef.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/17658679993.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/luxeporitefibujalub.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/51897282873.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/58697951689.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/zavesip.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210916065053.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/jozanijonetonigezud.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/81498822082.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/xeguxopejujajatulit.pdfIn PDF document text
    • http://metallpress.ru/files/mexula.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://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_off0000bcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD3 17332 bytes
SHA-256: 61ef5489271da492f450c834dc63ec2efe327deaf6f8c0ae73e770853ce9d48c
font_01_sfnt_off0000e9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E8 10780 bytes
SHA-256: 2bdc18acb604c1d960e6345711b02cf1393038c0164db9cd73e4c98f36b3d879
font_02_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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