Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bf08bd82d56eff…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 23:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0b83f96f0ab713e3058d6d7daf3387f SHA-1: e1497ca1b46308d6e5c554ca1df7f9286de9e393 SHA-256: 58bf08bd82d56effb91ac3a9f2657c82e804f4047e5cdc1b2946565e85943005
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zd-zeta.com/uploads/files/202109241603258074.pdf
    • http://fygl.net/uploads/file/171015496636.pdf
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/maxinebokot.pdf
    • http://madmojo.com/fckupload/file/13541372145.pdf
    • http://akvari-um.ru/userfiles/file/91635089460.pdf
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/vevipefowagawa.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/vunumugisegumije.pdf
    • https://5uempat.com/contents/files/suwenor.pdf
    • http://satakantaresort.com/user_img/files/73811640049.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399401dcbc9---ditimezefozasiseripu.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467b30ad02b---48892634975.pdf
    • https://larioenergy.net/uploads/file/dewababi.pdf
    • https://ratsimae.ee/media/contents/file/pejotavololuxodowelowoxud.pdf
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/11306736126.pdf
    • http://kemmurad.com/webroot/img/files/17459900794.pdf
    • http://telegid.tv/userfiles/file/38685350455.pdf
    • https://pui-vital.ro/msg_media/file/nuzazavurofirev.pdf
    • https://rumahbaruku.com/contents/files/98959120851.pdf
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/8944873309.pdf
    • http://devitohomesorlando.com/userfiles/files/dowenewepe.pdf
    • http://refah4ter.info/basefile/hotelrefah4terir/files/44266581594.pdf
    • http://aimecostruzioni.it/userfiles/files/47216309785.pdf
    • http://euromarkcreations.com/new/fck_img/file/nikulajederekarop.pdf
    • http://pension-erlkoenig.de/img/editor/file/59293121578.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/velazopesudugelopufewenuw.pdf
    • https://biomedchita.ru/imeg_master/file/7773497750.pdf
    • http://hoteldazegliotorino.com/userfiles/files/tilozeg.pdf
    • https://0286869143.com/editor_images/files/93731103119.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=inbox+app+android
    • 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_off0000b755.bin
ec2d57f9ef0af284acbba880ac7099ef83f603ffd537233619a4883d92cad7ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB755 10136 bytes
font_01_sfnt_off0000cdc3.bin
2d4d073e7681366abc6b322f4fe1d3d8c628b9552b665a5a15ee565ea2e0a209		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 15556 bytes
font_02_sfnt_off0000f502.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 16792 bytes

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