Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd209c180ea0eb5…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 11:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 407aa156264acdde401ba5687a5f30fe SHA-1: b179efa0700479b2a33c6ebd4c90f60ad29c5b7d SHA-256: efd209c180ea0eb5758b60370c0e61bbbde313915f16cd4374618cb734989cea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. The presence of external URIs and the link farm heuristic strongly support this attack pattern.

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://eatatrudy.com/uploads/files/76937179244.pdf
    • http://intemhathanh.com/img_duhoc/files/26730832292.pdf
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/57186743754.pdf
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/zanaxuno.pdf
    • http://support-cmu.com/filedata/file/lirajax.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/o7qmkdvosctehq18t5a1h1321m/73087136469.pdf
    • http://louisamerino.com/userfiles/file/9533815847.pdf
    • http://feach.ie/images/uploads/file/1955865792.pdf
    • http://chothuexeninhbinh.net/data/dulieu/files/91373359951.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/57798722040.pdf
    • https://jokerprod.net/userfiles/file/sutokesogewobitixenel.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161301fa536cb3---sezorezezixiwiradel.pdf
    • http://spartapr.com/images/upload/file/32570062147.pdf
    • https://wilocom.ro/ckfinder/userfiles/files/ruzifovazef.pdf
    • http://newdimension.su/userfiles/file/78523753750.pdf
    • https://livermore.com/wysiwygfiles/file/25814658810.pdf
    • http://status.cz/UserFiles/File/taxemanesokatazit.pdf
    • http://santeh.md/img/files/nozepuset.pdf
    • http://juha.be/_files/file/3400956932.pdf
    • http://105chers.netsociality.com/upload/files/32474701606.pdf
    • https://superchills.com/userfiles/file/46425869196.pdf
    • http://triple-a.co.th/ckfinder/userfiles/files/tozakosavafilixizupiroveg.pdf
    • https://latrinquette.com/upload/editor/file/ledetuxaxukide.pdf
    • https://sitycare.com/FCK-UserFiles/files/jipetoguxutikaveminop.pdf
    • http://perles-del-beya.com/userfiles/file/numem.pdf
    • http://lapenya.cat/imgjovesnaves/file/rinemali.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=rooter+app+apk+mod
    • 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_off0000d123.bin
8eab74753fab31dc1d9d6f100dc87834e2ac4f8ee7d355fdbdd428401beda049		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD123 16800 bytes
font_01_sfnt_off0000fc5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 16792 bytes
font_02_sfnt_off00011474.bin
dcb5843bf2a5bf6229b064ee57dc91279116d0d4e4b992aaf906f07fe94ae86a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 10280 bytes

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