Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b452a56d44e3e7…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 00:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd2ca0891c282c8701ffb94b14e7569f SHA-1: 1d156dace4d3570aae5e632c0833c49357781d21 SHA-256: 92b452a56d44e3e7c6700a8ea40bdac41bc49078e4b7ef6b5ecb201781205aad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many pointing to suspicious domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is structured as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://infrive.ru/uplcv?utm_term=the+affair+putlocker PDF link annotation
    • https://fsbulletsandbrass.com/userfiles/files/50842076613.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/rupamitu.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/371965964.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613df3974a979---57691363152.pdfIn PDF document text
    • https://trieurodata.ro/images/file/jifavejixepo.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/jogupixim.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/liwusuju.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/wusuvejujizu.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/ramegekijopovures.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/rarurevimurifonekewanen.pdfIn PDF document text
    • http://test-immo.com/file/vomadad.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/firagemabuwisuralujin.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/juzisamef.pdfIn PDF document text
    • https://endobible.com/userfiles/file/rukuzimawadavubibono.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/gixagejirexikiri.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613935780ba56---tukobupifamizukelagumevuj.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/11832597309.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/7153169525.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/77701654586.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/judiwexi.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/mozunedewusomiduvedeka.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/23448657736.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/padarunofut.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/56688538619.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/rememumedunupobik.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_off0000af42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF42 10460 bytes
SHA-256: e12ffacf4ad20a03090ed375c545f8ba4325b18a4717f46ce2679fd35236174c
font_01_sfnt_off0000c727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 14988 bytes
SHA-256: 01089b7d543a7e61f0f6da86bc23edd50bd9bd880ca776b1c269ca3915ffef60

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