Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5f824360e025b4…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 10:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2669cd58473706e846084ed7149ef799 SHA-1: b77dcfb06ee7bdb82e9fec6c69211b2120c3c0b6 SHA-256: cd5f824360e025b48e49533b2eed407b8cfc2b154c84a7c6346ecbe08d49eb69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The embedded URL 'https://coretry.ru/uplcv?utm_term=update+my+computer' is likely the primary lure, attempting to trick users into believing it's a legitimate system update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=update+my+computer PDF link annotation
    • http://giteduguedesboires.fr/userfiles/file/99160992919.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/piviwefadafev.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/21733558293.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/jilorajat.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/netubupotivojemo.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/39490319822.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/gusojawupivusos.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/55e19d6c8f3004a15df179abedc775be/lokifewanunamepe.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/lopelekonitoxibewojexi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae917180a7---47914546059.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/radevegivanen.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109140151393084.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/zazed.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/luzadibiwuxifuvemupola.pdfIn PDF document text
    • http://scarpatti.com/files/jewefukamobusod.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/54597951635.pdfIn PDF document text
    • https://mkart.it/uploads/file/jawakosibesubimadaviwu.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/23877973649.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/31786687336.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/jomududukuvare.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/lojiwovalekedufe.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_off0000ae27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC639 17292 bytes
SHA-256: e855607420015547a5bdf5f3b3da3327cf4bcabe39c3fd8fd3e3921eb9533cde
font_02_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 10488 bytes
SHA-256: c7ee0ac06f742faaca1814fa296b0a569d8d89be2a63e4844634611876e08b73

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