Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90ba7512316177b…

MALICIOUS

PDF

71.6 KB Created: 2021-09-24 22:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d8e7c692be3397d9b24f5ecae662ce2 SHA-1: 6a22463b29cc330b8c8d8d3a84d709d194868080 SHA-256: c90ba7512316177b27b07341335090cd497f4c924ce78183bd1da2b53042bebb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=solve+the+equation+and+check+your+answer PDF link annotation
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e799c28d---vafejumuxaj.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/55996092062.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/41631573316.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/tagorutisidalubivagu.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/wunizogaxakovino.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/zokisugu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/obup.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/pufodorujogukavoselete.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/fejiwufevonovuvudo.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/jusudubopedasix.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/gipuwifagaf.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/61655971110.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/segumuwawawadem.pdfIn PDF document text
    • https://renewone.de/files/8246242547.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6f65a2890e9de43be6a5f951352b1fde/dulifanixekamojizoboxu.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/mevirupege.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/68256616077.pdfIn PDF document text
    • http://393citizen.com/upload/files/zobavetogavovaw.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/66135093124.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/xonelofisarawadowifosibi.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/jaferubutuwowimevonobam.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/18007977990.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/duxamadajofaxoketuzemi.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_off0000b0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC904 11144 bytes
SHA-256: 7eedbba2ff430e0c8bb79f5f9b3fc0b7bb30ccb2af044502c7ecc832fe81bbd0
font_02_sfnt_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 17360 bytes
SHA-256: 179be9c85bc451bfc9479a5b8317f106c9d55bd2a276aefded573f05e39a70a1

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