Malicious PDF — malware analysis report

Static analysis result for SHA-256 16656f85abfe536a…

MALICIOUS

PDF

91.7 KB Created: 2021-09-17 11:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0af8d4d05e149c041c1988ca1eaa0490 SHA-1: f0d087ca9d7eac215bd10e7b9a572e983c78bdf0 SHA-256: 16656f85abfe536a6208320a42605b2364892ef1d5fac0db123543b0751e463e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically calls out the use of numerous distinct hosts with few links per host, a common tactic for evading detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=2+thessalonians+bible+study+pdf
    • https://vilus.cz/userfiles/file/gasopukulexibaxokijaxibij.pdf
    • http://eshop-kocicinadeje.cz/files/file/86360267259.pdf
    • http://centonze-vini.com/userfiles/files/zikegokemixulojadaji.pdf
    • https://kimcert.net/E/file/85420942265.pdf
    • http://gz-chengeng.com/uploadfile/files/kobixerasopo.pdf
    • http://njxinbell.com/upload/files/61346554915.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133684ee13dd---40670177146.pdf
    • http://vin-baietii.ro/ckfinder/userfiles/files/75852556368.pdf
    • http://www.bash.cl/media/file/78637666250.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/70877943707.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/96794951214.pdf
    • https://resortweeks.pro/userfiles/file/geruwiber.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/danixutotelijotov.pdf
    • http://tongkhomica.com/upload/files/rixudofobidavirixalazi.pdf
    • https://hogies.com/includes/template/uploads/file/kejajalukaseje.pdf
    • http://ymjgolf.com/file_media/file_image/file/mapugod.pdf
    • http://arrhythmiaclinic.com/userfiles/file/20210916083510.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ef18480630bf73855d988898136c3af0/nusaxeraredubutuber.pdf
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/43275419904.pdf
    • http://61kidsclub.com/userfiles/file/zenelatekidiweritof.pdf
    • http://nesthomes.in/userfiles/file/27694925836.pdf
    • http://harissarantis.com/userfiles/files/36364483206.pdf
    • https://stephankeppel.com/userfiles/file/xebojez.pdf
    • 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_off000101a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 16792 bytes
font_01_sfnt_off000119bb.bin
3e5f177554153b79d172f597cf3696ed1f143514de1e1958e5aa3e998b003ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 18188 bytes
font_02_sfnt_off000148bc.bin
b7dfaa2c68ce05a94393cb8e4eca45ef79246531881370ab677248e2cee82508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148BC 10872 bytes

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