Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ff20cbfb185657…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 21:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc28f20b7bbf97019a69e12165db03be SHA-1: 8dd1d0773a4ae98eb942bbc602126c0b01160741 SHA-256: b2ff20cbfb1856579458feb60f29eac4ce22d28b735d9693db6529f1f2cdb578
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it's designed to lure users to malicious sites.

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 http://xn--365-pn7mwb654m2qn.com/ckupload/files/denopikenadowozeji.pdf In PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/vovewadakitizureginoba.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/43739822725.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/68302907635.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/gimokafiwufisemomoverup.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210913232625.pdfIn PDF document text
    • http://momsystem.ru/public/file/5909218123.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/58597560923.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/49613671900.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/gixefunokojobiguz.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210909/0903258405.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/wapemame.pdfIn PDF document text
    • http://wernitznigg.at/files/winogot.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/16198064527.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/2790582384.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/pepibefep.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4d8e2281---liludugovexotixif.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/61594500367.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/nulunivege.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/jigesi.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/junizidagi.pdfIn PDF document text
    • http://wirheiraten.de/images/file/15673102792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=best+s+pen+games+note+20PDF 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_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 10652 bytes
SHA-256: 38ce3d3040997c71e5ee777287b50bb36b5296961ed37e93c44d53bfc290c8e9
font_02_sfnt_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 17572 bytes
SHA-256: 9a7375ef99f2b74e98d7ab083b359aa76e9a37299eee9a7fa06746f9ce869bb1

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