Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c26f2f51d5b554c…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 00:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87dff097c9894fc26404c3a0e3fc82ee SHA-1: 6a8bdb47d57d524064c71ba92dd2d3efb501864a SHA-256: 3c26f2f51d5b554cd075da4f4ee26c6ab1dbbee916bce1299664dcaba646bd63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies it as a link farm on disposable hosting, and the PDF_URI heuristic points to a URL that appears to be a redirector.

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://crewmak.ru/uplcv?utm_term=what+is+a+rooter+device
    • http://crescentcarpets.com/userfiles/file/xotosemogejegiz.pdf
    • http://glttek.com/userfiles/file/zuritisedurupujitowumunab.pdf
    • https://www.ftha.org/admin/ckfinder/userfiles/files/17567627573.pdf
    • http://veterinariacasettamattei.it/userfiles/files/zubolowuwubimodu.pdf
    • http://hmed.vn/upload/files/97628468759.pdf
    • http://samocvet.org/foto/ck/files/ninewabitepesuxalaxinoxu.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613469209031e---20724170752.pdf
    • http://cattaneoarchitetti.it/userfiles/files/givuwavoposemafazut.pdf
    • http://yanarfabrics.com/firma/files/84676881597.pdf
    • http://baiduvpn.com/upload/files/xegovexolijedabiwitavufi.pdf
    • https://partnermind.cz/images/files/4015014086.pdf
    • http://strandedtattoo.com/file/gajitofevumawamupipo.pdf
    • http://dainichiji.com/upload_ckr/files/23810577092.pdf
    • http://purel-biopharm.com/upload/files/23535333695.pdf
    • http://hissekurban.com/resimler/files/mevugosigegomo.pdf
    • http://pes.edu.mn/ckfinder/userfiles/files/legapezuridegu.pdf
    • http://dd-eng.com/files/files/21073963802.pdf
    • http://www.anclupnapoli.it/userfiles/file/60636361211.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/puzepuzumi.pdf
    • http://richmediahouse.com/admin/uploads/file/kelupojaxekowigigerukuka.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fecbdaabaf---55033070757.pdf
    • http://thrifty-uy.com/files/others/74292050853.pdf
    • http://tongrentangthai.com/UserFiles/file/sogofaj.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_off0000b95f.bin
dbc5482248f4997e7d033eccfedef2951759147d107b9f8d15b665c336504a4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB95F 10376 bytes
font_01_sfnt_off0000d114.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD114 16792 bytes
font_02_sfnt_off0000e926.bin
a9dcba421c5613014146bbddd23e00c428e9722620064ba7ef9768494d9bd31a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 16012 bytes

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