Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8ebc2e790b3858…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 09:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0aff5046ee8ff7a690e873545cc457d5 SHA-1: 00fe26bb9579a3b8e326985e21da5231d21f4589 SHA-256: 2e8ebc2e790b38588ddbbbaefb712f5cf7c5ec689a22035419ef8cc59f530d43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a significant portion pointing to disposable or unknown domains, characteristic of a link farm used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

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://agrostroi-proekt.ru/ckfinder/userfiles/files/pamakewelububus.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/70702628767.pdf
    • https://gencshoworganizasyon.com/upload/ckfinder/files/88135500856.pdf
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/93586628577.pdf
    • https://kaptenhoki.info/contents/files/74354155441.pdf
    • http://babyindex.nl/images/uploads/gabajopazojakega.pdf
    • http://venkateshservices.com/uploads/90771329776.pdf
    • http://tv-sat.cz/userfiles/file/9520526591.pdf
    • http://energywork.pl/userfiles/file/rurujafuvujusuvuvowus.pdf
    • https://emtracing.net/userfiles/file/77243694048.pdf
    • http://visusmarble.com/images_upload/files/47166086250.pdf
    • http://laserinnsbruck.com/static/62769258629.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcaa7c087f---sisaxonebujuxaduzele.pdf
    • http://explosivedevices.ru/media/file/xagosusagakol.pdf
    • http://devison-matras.ru/upload/file/wepanakuniriruvizajodaw.pdf
    • http://4darchitecture.org/img/all/31820319222.pdf
    • http://mgocsm.in/userfiles/file/33519494161.pdf
    • http://6nergy.fr/6nergy/sites/default/user/file/befetufavifilaxa.pdf
    • http://cafesezony.ru/fck_editor_files/files/61115624952.pdf
    • https://virtualpulse.eu/UserFiles/file/1268164379.pdf
    • https://mclandpin.com/calisma2/files/uploads/99316411743.pdf
    • https://afayl.com/userfiles/file/gazel.pdf
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/42022285500.pdf
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/wurejirulurujirejubop.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c164e41256---31735363167.pdf
    • http://zezoalza.com/ckupload/files/85466086638.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=send+videos+to+android+from+iphone
    • 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_off0000dc36.bin
13ef171bb21e1704bd19f6fee5ba5edfce1e84b9caf0fa46173ed5817c0b6175		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 17688 bytes
font_01_sfnt_off00010960.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 16792 bytes
font_02_sfnt_off00012177.bin
18e12ed58f932b650177792713a2419776f1cfff279b6c10de5ab0dd47dfa434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 10856 bytes

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