Malicious PDF — malware analysis report

Static analysis result for SHA-256 83522f816adccca3…

MALICIOUS

PDF

89.9 KB Created: 2021-09-16 14:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27bec061ba65af0b2ae267f176f1821f SHA-1: 32b0e9bdbebf80afe89298e459798adb314d92c1 SHA-256: 83522f816adccca3dbbc051511c3ddbff267e877b0e98c44149c3f355f083a7a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://thueotodn.com/uploads/image/files/67707789922.pdf
    • http://naosgym.com/userfiles/files/92978061324.pdf
    • http://vhz.cz/user-files/solomimejapulokewolopazif.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b87baa659---33764249346.pdf
    • http://klccpa.com/userfiles/file/41281705274.pdf
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/44171362199.pdf
    • https://fleschimmo.lu/userfiles/files/gogikazepotovobixotuzo.pdf
    • http://xn--9w3b270a7kf.kr/data/editor/file/43641916775.pdf
    • http://bowlingkillers.com/imgdb/files/nadab.pdf
    • http://laboratorioshamalab.com/userfiles/file/67462663395.pdf
    • http://lso-msm.fr/userfiles/file/17647638730.pdf
    • http://charmingcurls.se/upload/file/dukajidonozoda.pdf
    • http://hodinovysoused.cz/upload/file/lusoxanulisakatutew.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be788d0c3f---92306451764.pdf
    • https://aldwalia.com/userfiles/files/zokoj.pdf
    • https://mehreganimaging.ir/images/upload/files/fefupabiluzugajudaf.pdf
    • https://k85shj16h-561lt.com/contents/files/23895218150.pdf
    • http://oletrans.sk/editor_uploads/files/87813939221.pdf
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/fimawunatit.pdf
    • http://swapnakoodu.com/fck_uploads/file/rifakedurovuki.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/gokosovalekir.pdf
    • http://peak-experience-europe.com/images/blog/file/vasuzibir.pdf
    • http://hodinovysouse
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=name+of+the+biggest+country+in+the+world
    • 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_off0000fa49.bin
3cfa639b97b28efd2401b308e0083417b700594de7eaa52e3716f207cdf4cd9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 17588 bytes
font_01_sfnt_off000127d4.bin
322c927a94a762c013689ba79e47e4a3059144766c847567f3bc2976cfaab789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127D4 11340 bytes
font_02_sfnt_off0001422e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1422E 16792 bytes

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