Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b30941822e5da7…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 06:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0ca37b33020216f4ecf487cfc90cba0 SHA-1: cb8c9d0d3f70effa9ad59e323f8c3b5ee7049e23 SHA-256: 54b30941822e5da7fadb77e3f1c8764e5dba7260c058c3f0e3524576699f61c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to suspicious domains, indicating a likely attempt to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://typeone.com.my/ckfinder/userfiles/files/12543926340.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/18bd6cc7b516ef0648bf779cece16cd0/berijutirediz.pdf
    • https://servicepapik.ro/files/xadizal.pdf
    • http://tuttotop.com/userfiles/files/37675648289.pdf
    • http://bdpq.hungminhits.com/files/uploaded/files/paruvirenenewanadis.pdf
    • http://debseven.net/UserFiles/File/gagelufojixefa.pdf
    • http://geometracosentino.com/userfiles/files/92106846741.pdf
    • http://digitalpolicycouncil.org/imagenes/file/69172295671.pdf
    • http://szzxwx.com/Upload/Upload/file/202193125254281.pdf
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/metegaje.pdf
    • http://whuntex.info/userfiles/file/69183252275.pdf
    • https://sgcaregiver.org/contents/files/winuwutupojafetib.pdf
    • http://cukiernia.eu/upload/files/kuvidun.pdf
    • https://goldengatetaichiqigong.com/userfiles/file/lovovaluvupel.pdf
    • http://fipjp.com/userfiles/file/fafosiwivesudatovin.pdf
    • http://e-motyle.natura2000.pl/imgturysta/files/miwamidogamatatuzuteziba.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/250268293.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/ribikupabajemosirikeze.pdf
    • http://palaciodelosnavas.com/userfiles/file/gulufuroli.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/tujexunojuwev.pdf
    • http://kammerchor-lindau.com/file/romezefovurexutufimulok.pdf
    • http://stickerbarcode.com/file_media/file_image/file/57847327259.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=black+ops+2+zombies+cheats+ps3
    • 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_off0000d2e4.bin
c74e01c677bdbb74be69b2dd193a0c288e0ba7aa50c2d01f8920148d6e96be1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 11072 bytes
font_01_sfnt_off0000eca3.bin
1c559dbd3013adacc4f4c34d9c167427b437a2bc14d5474441bae0cec9f84ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 17784 bytes
font_02_sfnt_off00011a52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A52 16792 bytes

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