Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ab75dff7a9c789…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 14:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c80b7c0fdb2433161ce599b4a5b3317c SHA-1: 11ad3c7e73ed3259de48e56f7c9f6edeb2addcb4 SHA-256: d1ab75dff7a9c789d9702ff072079cae8e7a886cf25fb126202a37f1f45f5bbe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, often as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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.
  • 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://queure.ru/uplcv?utm_term=kodi+apk+builds
    • https://ever-progress.dacola.com/upload/files/47806844351.pdf
    • http://zap-interactive.com/uploads/files/joxuguzowom.pdf
    • http://educasters.co/ckfinder/userfiles/files/bagiwaxelebodufumebaf.pdf
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/soperedomuvap.pdf
    • http://pivotal-technologies.com/userfiles/file/bajogasozowujexidemusu.pdf
    • https://plagij.at/ckfinder/userfiles/files/53101540236.pdf
    • http://www.sas.edu.mn/ckfinder/userfiles/files/legekalujodawexezegajuki.pdf
    • http://scouttautomotive.com/editor_uploads/system/files/67471249009.pdf
    • http://kystar.net/filespath/files/20210908025727.pdf
    • https://nieruchomosciturystyczne.eu/files/file/sasafazokuzuzusetesujebix.pdf
    • http://staceyasp.com/UserFiles/file/10162871663.pdf
    • https://asiantms.com/ckfinder/userfiles/files/6811420336.pdf
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/nevozasozolabozukuzige.pdf
    • http://360global.ca/userfiles/file/46310358507.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff98d4097---73222348049.pdf
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/piponi.pdf
    • http://macautemple.com/userfiles/file/nakorefibonu.pdf
    • https://cancelaria.pl/galeria/file/499379177.pdf
    • https://securitydm.com/slicice/file/98274325844.pdf
    • http://lnhaihui.com/userfiles/file/20210917113412_542719878.pdf
    • https://sysyanginguvenlik.com/uploads/files/99046097692.pdf
    • https://ijfbacknumber.com/editor_up/sagatovodesurakedaxo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB40 16792 bytes
font_01_sfnt_off0000e352.bin
c0657896c514a234290b6d48678de54168e1f023134f823aa4d9999000be132b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE352 17412 bytes
font_02_sfnt_off000110c6.bin
5308dcdc9a703590fdffd8d2426db4212a1616c5cdc6a1efdd5b15326f7a2237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 10272 bytes

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