Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f71c26796582331…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 20:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48f07a9b68e22ba4b7a07f33d9993b87 SHA-1: 3f793e85fdd4046b3eded2d84925c4d34bdb6cfa SHA-256: 2f71c267965823310e403d377b4163da960cbc9a01f2b2133694626fc8d3a2af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://samwha.com/upload/userfiles/file/rusegopon.pdf
    • http://around-sicily.net/userfiles/file/51781728898.pdf
    • http://www.kymenhome-etsinta.net/tiedostot/files/27127956167.pdf
    • https://machinex-machines.com/UserFiles/File/vuvavagir.pdf
    • http://mweb.cz/images/file/34063377788.pdf
    • https://xuanhongkhang.com/upload/files/85725160118.pdf
    • http://karinameal.com/imgdish/files/68134553539.pdf
    • https://www.nstoplana.rs/ckfinder/userfiles/files/pomodujutepakuw.pdf
    • http://netmode.net/app/webroot/uploads/files/39917834737.pdf
    • http://lerucherdesanges.fr/userfiles/file/fipoxulidogawesinijif.pdf
    • https://ruh-center.ru/userfiles/file/gotafogag.pdf
    • https://garnet-medical.com/userfiles/files/32731712719.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/lipip.pdf
    • http://lunaleo.pl/userfiles/file/duzofenuror.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614c965cf32c3---wimubobukuzozejajoxuzaxeb.pdf
    • http://audyt.rowerowaszkola.pl/imgturysta/files/kuxojikeruruvemuzejavoz.pdf
    • http://izeninfo.net/admin/upload/files/3194769021.pdf
    • http://sjzhtchem.com/upload/files/17714804034.pdf
    • http://www.armstrongre.com/files/files/wukopukojol.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca7e6cc8fc---dorikujila.pdf
    • http://archi-m.ru/userfiles/file/77716461769.pdf
    • http://suurelepa.ee/data/file/88787978064.pdf
    • http://ekvatorbl.com/userfiles/file/86938841635.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/719bb4c8f64d6bbe2683fe76606baa72/83331011261.pdf
    • https://ratoempat.com/contents/files/dutenude.pdf
    • http://greddy.com/admin/common/ckfinder/userfiles/File/86813014387.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=war+good+god+what+is+it+good+for+lyrics
    • 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_off0000d824.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 16792 bytes
font_01_sfnt_off0000f036.bin
a23fd7db9f701faa006307017285cefcb54da121f6d998fca13c7a4755b4a1af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 17168 bytes
font_02_sfnt_off00011cc4.bin
1ecc06e9382c325741c5fc52585f73c0271b4cd18626d4bafa37cf8916a24c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 10712 bytes

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