Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb5bb5ea5ef564c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 03:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3dec1b14d6444e6c35bff7c066962bc SHA-1: bf73223ca3a0226a397e95aacdc7160e76729044 SHA-256: 6cb5bb5ea5ef564cae500cfce579e8f3037975da6f446f84e921be54f3bcf75c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to external PDFs hosted on various domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links strongly suggest it's designed to lead the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://elitaliaweb.it/upload/file/wogakovutilijuxifidoxito.pdf
    • https://izr.fr/files/bowekovemuginitofinabo.pdf
    • http://megatex-plast.ru/pub/file/265535700.pdf
    • https://sysyanginguvenlik.com/uploads/files/99046097692.pdf
    • http://investbuild.ru/var/upload/file/91015826684.pdf
    • https://tlkingatlan.hu/kepek/other/file/gotoninekupejezukilej.pdf
    • http://ayurvedicclinic.org/userfiles/file/77436572089.pdf
    • http://ecohort.com/userfiles/files/92532915560.pdf
    • http://sky1981.com/asset/uploads/files/ziwonofoxomafutal.pdf
    • https://nocnepal.org.np/ckfinder/userfiles/files/vetin.pdf
    • http://unixsensor.com/uploads/files/202109040713151073.pdf
    • https://kurtoglumob.com/upload/file/niwurofufomumok.pdf
    • http://tuanayapim.com/rsm/files/86949717571.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdb272d734---danawekulixupunovadik.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f17af4c6---25970008197.pdf
    • http://chronocertif.com/userfiles/file/livagoka.pdf
    • https://coffotea.com/uploads/files/202109091644367109.pdf
    • https://dycmc.com/DATA/upload/files/202109030826143611.pdf
    • https://maxflowfans.com/userfiles/file/30690512799.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/vawituwa.pdf
    • http://edukoc.net/userData/ebizro_board/file/79054652473.pdf
    • https://durgabas.coop.np/ckfinder/userfiles/files/94958907211.pdf
    • http://namuvaldymas.lt/userfiles/file/20115829351.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/pejilidiperoz.pdf
    • https://seikai.jp/free_images/files/16573902448.pdf
    • http://onelove.cz/file/buful.pdf
    • https://kibledergisi.net/resimler/files/losugewasezaki.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+create+pdf+file+programmatically
    • 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_off0000d7e7.bin
42582e22e448217e52d68a5ae31b887cb54962d84c1a87231a3305ba3ad28bb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 10892 bytes
font_01_sfnt_off0000f0e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 16792 bytes
font_02_sfnt_off000108fa.bin
ea8e5f90566d1a46072ab615e77ac4a1c3c6c0a94a080984401db11da58b9865		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 17508 bytes

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