Malicious PDF — malware analysis report

Static analysis result for SHA-256 db45a63dfb09a3d3…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 10:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd358f57b4eb755a119494a6fcf47f65 SHA-1: d87709a484a3ff71d3b0efba4a7e9c830195a9f0 SHA-256: db45a63dfb09a3d350b57e9fd8a3a64bd2f4b7730b9976e9ba1d313454cb9069
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://newsru.md/upload/userfiles/files/dekimoxadolebumefolil.pdf
    • http://sys-svinding.dk/userfiles/file/soleturinixiduminijinepeb.pdf
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/79169560892.pdf
    • http://membranekeyboard.pl/_data/file/xevogusepemefelibonad.pdf
    • https://enerjimakine.com/tsrm1/img/userfiles/file/turuk.pdf
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/lerasojaxa.pdf
    • http://fantacyhandicraft.com/userfiles/file/38839769048.pdf
    • http://preiswerte-unterkunft-papenburg.de/mediapool/xurot.pdf
    • http://elpijisystem.com/file/70244126870.pdf
    • http://phuongdonggolf.vn/app/webroot/uploads/files/5525735659.pdf
    • http://wwpokebar.com/uploads/files/57213635376.pdf
    • http://absolutelyneon.com/userfiles/file/98859371039.pdf
    • https://btcauction.vn/hinhanh/file/kisemafu.pdf
    • http://esipro.fr/userfiles/file/tosepemojiv.pdf
    • http://watch62.ru/files/files/88964521417.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/1908563910.pdf
    • http://mathrainbow.com/userfiles/file/sewaw.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/jovenekovolum.pdf
    • http://hk-keber.de/images/file/vavizevare.pdf
    • http://versobrokers.eu/userfiles/files/68248395839.pdf
    • http://lindendirect.com/ckfinder/userfiles/files/54542064920.pdf
    • http://goldmustang.ru/files/files/35248835899.pdf
    • http://studio-rivetti.it/userfiles/files/14957565788.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+studio+failed+to+load+jvm+dll
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bacc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBACC 16792 bytes
font_01_sfnt_off0000d2dd.bin
d31dc96a7107996bc3cb07ff18c19ee30afeb02a4344526f6436ee06464bcd42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DD 16236 bytes
font_02_sfnt_off0000e899.bin
640d17feac3f6aa4675b546adfca03f2010c40d20c934fdfc4f484c56ad1811b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 20324 bytes
font_03_sfnt_off00011bb8.bin
3a8b6ae15f8ad93c5c01ad22a422fd735d7e2097be24f26d80c2fbce15f304d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB8 10792 bytes

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