Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2a255038f24e0a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 10:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbc90747ab6931139b3707c8d1921471 SHA-1: 3b904e150b2fcd9c230db7c3ea0dcf8e1c15f538 SHA-256: ad2a255038f24e0a489e7bbc1f1b8d69e443899cdf1149419d60a66675898921
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malicious redirection attempt. Although no scripts were explicitly extracted, the nature of the embedded links and the overall detection profile point towards a malicious document designed to lead users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=is+bacteria+a+prokaryote+or+eukaryote
    • https://iqmuseum.mn/uploads/files/mulanofozufinolub.pdf
    • https://topclassgreenery.nl/images/file/87960593916.pdf
    • http://autosklo.sk/pictures/file/86896275640.pdf
    • https://scavilecis.it/userfiles/file/40285466160.pdf
    • http://jfe.hk/userfiles/85628481154.pdf
    • http://yongqingtech.com/d/files/furimezamapenedija.pdf
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/15523098681.pdf
    • https://infoenergie-loire.org/userfiles/file/vabozirana.pdf
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/xejexogikasi.pdf
    • http://cheumst.com/upload/fckeditor/file/65082051694.pdf
    • http://ride.hu/images/uploads/files/72447868751.pdf
    • http://ville-dammarie.com/ckfinder/userfiles/files/83033852821.pdf
    • http://abwrosedale.com/uploads/files/mufodapelipuseronarano.pdf
    • https://cicadit.ro/UserFiles/file/lepojutasotogakosavi.pdf
    • https://goodline.by/userfiles/file/suwosorosajamopidewukivot.pdf
    • https://plantbiochem.com/ckfinder/userfiles/files/pisagiwujopimajifoboruja.pdf
    • http://c-six.it/userfiles/files/47970735228.pdf
    • http://aimecostruzioni.it/userfiles/files/45846317146.pdf
    • http://kramnyca.info/img/upload/editor/file/70252297729.pdf
    • https://profm.hu/files/file/30729619702.pdf
    • https://exlite.it/ckfinder/userfiles/files/vopegefafozumifijipi.pdf
    • http://tznjl.com/userfiles/files/gawumonasodavupofi.pdf
    • http://chieucoingason.vn/files/kakuwiwotodabomisemaripe.pdf
    • http://khachsandomino.com/hinhanh_fckeditor/file/lumafedefagubigerufuboxo.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/85984108852.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_off0000b32c.bin
aaebe7d2a74cc631a5c0980f73e3268da2eb3fe7eb4aca02a2debac0554b8f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB32C 10616 bytes
font_01_sfnt_off0000cb75.bin
475511f9657adc52025cef4526f57df7040249ccd75423681bc869a28f4739c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB75 15772 bytes
font_02_sfnt_off0000f301.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 16792 bytes

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