Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acdb9fb35386f40…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 04:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 61eda3547cad43e51de9b56f93d2adff SHA-1: bc437d4d7d72c93ff5223615fcc4c622f88a54d1 SHA-256: 6acdb9fb35386f408b972fed66e39c647c3ddea75669b29fcf9e9d40fbf71df1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=backcountry+navigator+apk PDF link annotation
    • http://nguyenphat.com/public/default/ckeditor/files/rapafekijosapikowapu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613583c85cef3---13180023480.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/mutilurorazeg.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/53052840307.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/19091633389.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/80045799810.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/vagore.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/bd267fda51351adf6ecf90aeb8a82642/57872374460.pdfIn PDF document text
    • http://fruitsad.pl/images/file/97551347207.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/bemaw.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sulabegajabezejupuduj.pdfIn PDF document text
    • http://canadianrockies.info/files/file/32787769277.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/fovobunikaruwep.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/semobofexino.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/60785012600.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/58842582028.pdfIn PDF document text
    • http://expresskaliski.info/file/19652208580.pdfIn PDF document text
    • https://cmf8.ir/data/file/toponuvadufifek.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/39256321064.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/77227213781.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/56880363636.pdfIn PDF document text
    • http://le383.com/uploads/files/10795444894.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_off0000d76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 10628 bytes
SHA-256: 082675efc231c8ffae461b741ee0e54a8e22da694728c984900d24dfea595b01
font_02_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 18284 bytes
SHA-256: ea4bc167e38406f4e7da06671b90f2ccbd627c75e1d7d37e60f63075266108a4

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