Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec95e57a2e40f5e3…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 06:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12a4aa8fb7d9a787a0df1134febd46e5 SHA-1: 741d9f6bffa6142a4a3acd57db812eea4242cd16 SHA-256: ec95e57a2e40f5e36d529afd89ca21335546c4f14a50908cf6df15f7252e4537
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one that explicitly mentions 'hack version download', suggests a phishing or malware distribution lure. Although no scripts were extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/uplcv?utm_term=fs14+hack+version+download PDF link annotation
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/kewel.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/83319274043.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147b5b99ec22---xapivugetitenekosi.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/44163075025.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/9902635479.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/getuwupababejoripaduxa.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614650a07993f---49500533846.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///51726674432.pdfIn PDF document text
    • http://chinalabware.ru/d/files/19141248114.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/396439133.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/33258577493.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/15554422.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/57958100806.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/41737095840.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/20098274242.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/19703346241.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/gewavezivufidugemizada.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/jetijubobapelujidavuvot.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/vemideguperogiv.pdfIn PDF document text
    • http://school15-tyumen.ru/f/likepelisebomixa.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_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 17436 bytes
SHA-256: 4f68cf68dfd31e2eacac82700eee127b8732cf5ff3e3e02babc55fbebebf4fae
font_01_sfnt_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 10720 bytes
SHA-256: 9df214d0305f9235ab009055ae4612a8dcfdf4e1db380432f0c7d8a00b860fee
font_02_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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