Malicious PDF — malware analysis report

Static analysis result for SHA-256 feaff681a5f21e01…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 03:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38531f98b332561ccaf749abe4884b45 SHA-1: 8e61bdd0d10bbafdb5368e6a69d34082d1a1b1bf SHA-256: feaff681a5f21e011feaeb62e61bcbb8f831721815b3115804acd27318c1e12d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to distribute malware or facilitate phishing. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=mobdro+apk+for+android+download PDF link annotation
    • https://oreopay58.com/ckfinder/userfiles/files/sedebadezisovezajavafixu.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/takuzekakukaduno.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/75954086760.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/fetokatuvanuxega.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/91036166971.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161365748ac9a5---72278508056.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/jokikutepuno.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/37595289584.pdfIn PDF document text
    • http://agavietnam.com/img/files/zokebelisaronuzegavusaz.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/fevunufiselagog.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/14810274388.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/venaparitagilogukisag.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef16ae711d---wovigisumupixeminukeput.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/gubijabififozewobikumifa.pdfIn PDF document text
    • http://idroter.org/userfiles/files/lamupurif.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/30418367504.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/midoxubekenosugawiruro.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/52560123860.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/57100307331.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/gufowikowadomiliviwiw.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/jokigovevasulus.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_off0000d3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BB 18312 bytes
SHA-256: 7278b57e6a5ac3015e7779f79deb0a65bfd7ebf379f94fddeffe38da0f1230b7
font_01_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 10404 bytes
SHA-256: 75953a394d779f71a7111664ff8cf6d2dcbf7889536fb9e3eca96c89d3f4c6bf

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