Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd4a0247c9cac50…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 20:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0513fc510c36fc77b6d361b6fae22bdf SHA-1: d4567046949bbd4e01eee2c808dbd2dcae66b9c5 SHA-256: ccd4a0247c9cac5061eb77ba8fbb20c5680244f1c1f56dfdefc07426ad1fe23b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with numerous distinct hosts and UTM parameters, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.centrosanmarco.eu/img/news/files/31034861670.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142e4ad73987---60442132452.pdf
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/xilelate.pdf
    • http://tiwtactic.com/userfiles/files/60310808786.pdf
    • http://kite-surf.sk/files/ravabazebiratema.pdf
    • http://turksebruiloften.nl/userfiles/file/lixabazupewazukodijebi.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/40555174244.pdf
    • http://www.deep2001.com/images/library/File/33726711365.pdf
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47992636610.pdf
    • http://jhdjt.com/images/upload/File/rimarid.pdf
    • http://pickup-ws.com/userfiles/files/64848158804.pdf
    • http://matras-devison.ru/upload/file/68459219361.pdf
    • http://ailizia.com/userfiles/82751702547.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/82556144982.pdf
    • https://topupdana.com/contents/files/ribotixox.pdf
    • http://orsini-blasioli.it/userfiles/files/venovesigegijizax.pdf
    • http://gianenricofabro.com/userfiles/files/fowodadosuxowuzatut.pdf
    • https://fsreloading.com/userfiles/files/84174543953.pdf
    • https://krygina40.ru/UserFiles/File/vizugefumiga.pdf
    • http://herium.net/FileData/ckfinder/files/20210907_881B85C69894E712.pdf
    • http://minipit.com/data/files/5748560351.pdf
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/17749529738.pdf
    • https://mysilo.com/upload/ckfinder/files/56614203752.pdf
    • http://saigonradio.com/userfiles/file/65841924025.pdf
    • http://hnc2.com/userfiles/file/67341615374.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/b02fcdae8514d890446ba94990f0955f/rupugetizud.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=recon+x+apk
    • 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_off0000e178.bin
19295060aebb043fa88874428e9e1744afec98d0a17bbbf78b3ff4df18d8e370		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 10100 bytes
font_01_sfnt_off0000f81f.bin
f4c70ba10a4b2348429c96f008917461df556381c5d57fe6c58af70ac0f72d1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 18356 bytes
font_02_sfnt_off00012832.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12832 16792 bytes

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