Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb11d33c6257a65a…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 23:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c4a42ee97d12a84844ad0908c5b04563 SHA-1: 3029351f322a21149041d0db81d2725108fa731e SHA-256: fb11d33c6257a65a2d94504ed85792e57174d3e24d8ae54c5ca5e016715c569d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs, with one heuristic specifically flagging it as a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://glamour-nsk.ru/ckfinder/userfiles/files/gojinej.pdf In PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/juwum.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/698974827.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/suxuwoguwezeku.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/90079486868.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/xijekep.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/gugivikojolenigabiremim.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161581387583bf---jiwazore.pdfIn PDF document text
    • http://ridendo.cz/files/file/tetoxokimusez.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/kibafujudus.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/jifexiboxutofuvo.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/98117654055.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/45969672855.pdfIn PDF document text
    • https://kapefashion.com/files/files/4167912677.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/tinezumosefovojamox.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/39729523350.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/80396440202.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/nezagibizutipiranuxate.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/gijexos.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/31655281672.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/walibulovoduzipom.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/vawajuferiperamomagudofug.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210904180730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=short+vowel+sounds+with+aPDF 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_off0000ae36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64D 10672 bytes
SHA-256: 28ceb74ac483f3e21d5b7ad204971a43f5feaddf6980353949372c1064bb89a9
font_02_sfnt_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 16428 bytes
SHA-256: 9ed1aec1d298c40e6f1c38b33071469051f88914126c15e0bd30b40f949e69f6

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