Malicious PDF — malware analysis report

Static analysis result for SHA-256 86189541f1657fd4…

MALICIOUS

PDF

86.7 KB Created: 2021-09-13 06:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd93304cae8201b6f01d8d7db9e3a61a SHA-1: 6e987843c5b5346e9c6b78c0182521721eafd7b1 SHA-256: 86189541f1657fd476947f214258c3a048bf20c567845d67eb05a04f9c87e897
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs hosted on disposable domains, suggesting an attempt to lure users to malicious sites. The embedded URLs and the nature of the PDF structure strongly suggest it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pistant.ru/uplcv?utm_term=where%27s+my+water+full+apk PDF link annotation
    • http://hfnhsw.com/upload/files/70518650553.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/negobixiwavevutameg.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/60997091147.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/39990611375.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/lafusuxozomudapureg.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/xavefunijufojevozuta.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/53255026763.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/1983226948.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/lobolixukobis.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/jebogifu.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/6952026942.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/68597280356.pdfIn PDF document text
    • https://semut73.com/contents/files/tokigibixuliwigumapo.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/89183224630.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/69742231531.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/lokaxo.pdfIn PDF document text
    • https://mangallagn.com/images/file/34943755636.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139051a4348f---74944107143.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/82664206319.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_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 17492 bytes
SHA-256: e60512f447ddd8b4fd50960388dc8a44dfcf1d49d53c2fdc673ef2ebac88e7d7
font_01_sfnt_off00011c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9B 10728 bytes
SHA-256: af42e6354d7b3d6c59b09d3ae6e575eaf4e28800587741fbe4e7545bf005a702
font_02_sfnt_off00013571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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