Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2a5f056feae0b6…

MALICIOUS

PDF

75.1 KB Created: 2021-10-01 00:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 909ecef69a7a65aa545b24875f8ba498 SHA-1: be9fb41d855595b2b839a8823cf1d1031b2b9207 SHA-256: 6f2a5f056feae0b60cf3599adc9fab9e6969d463b618ed0d610d701bdaddb54e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, indicating a phishing or link farm attack pattern. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the intent is to redirect users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://allytemp.ru/uplcv?utm_term=dbz+live+wallpaper+android
    • http://kenshopvn.com/uploads/files/30612920809.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/71933715721.pdf
    • http://www.azurwelcomeservices.com/userfiles/file/gogutos.pdf
    • http://makassitools.com/userfiles/file///romeduxivevobujikakew.pdf
    • http://www.culturehousesun.org/photos/file/buxagebipikes.pdf
    • https://vibanghanoi.com/uploads/files/pumefesajuwu.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b4a2b270e---23458342899.pdf
    • https://nangluongvada.com/uploads/files/51870572477.pdf
    • http://vet-spb.com/userfiles/file/bebevinajumomopovumibu.pdf
    • http://gammatradings.com/userfiles/file/raranupexemasapolubegob.pdf
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/zilifejefurexolipulo.pdf
    • http://pxmonastery.org/CKEdit/upload/files/75161724514.pdf
    • https://kaptenhoki.info/contents/files/94938939723.pdf
    • http://andreaslasnik.com/data/files/30704642400.pdf
    • http://kramor.bg/userfiles/file/54358312428.pdf
    • http://robwalker.net/fckupload/file/kabapefanikivopop.pdf
    • http://corkpotters.com/images/xogujejas.pdf
    • https://celebicatering.com/upload/ckfinder/files/3069619048.pdf
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/42164972867.pdf
    • http://autolubitel-irk.ru/userfiles/file/vamoporofel.pdf
    • https://codecs.ro/images/file/82861860512.pdf
    • https://natinsel.com/imagenes/file/75360075449.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/99612213218.pdf
    • http://igabana.com/upfolder/e/files/20210911142115.pdf
    • http://www.puhito.hu/uploads/75330317881.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_off0000bf50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF50 16792 bytes
font_01_sfnt_off0000d767.bin
643e0bc754a91591286680b5e1edeed2347f3ec9ff0d2932cfdcef847d2197e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 10472 bytes
font_02_sfnt_off0000ef16.bin
b0f1270bf51de911c791c67ea7aa109cf16e57e6836a7032290b71790ff965d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 17724 bytes

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