Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbb789bf667afc5…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 21:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d175adfe82fde2782d75632d9cb85f4d SHA-1: 69a0926c1eb83643e2dda051266a1535652979c5 SHA-256: ffbb789bf667afc54630977c206abce94cee1ca16629ff3ab9e0279c77a0f05a
146 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URIs, many pointing to disposable domains, which is characteristic of link farms used to obscure the final malicious destination. One URI specifically points to an IP address, further suggesting an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.ags-sib.ru/ckfinder/userfiles/files/fatotes.pdf In PDF document text
    • http://cl-pub.com/files/files/dujedamigip.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/62099985246.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/basitinagi.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210910200137.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/97285514568.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/79315462812.pdfIn PDF document text
    • http://hidropro.hu/upload/warazaxa.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16133761d31de3---vobozatamiwakalowet.pdfPDF link annotation
    • https://larioenergy.net/uploads/file/15680814714.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/milukukelabubebepogoke.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/98524884919.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/puwimivumegazobejevat.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210913191025.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/3130401641.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/zafiwo.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161303381e81a6---fedikojimebobopad.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/rizojub.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/3551486769.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/30751026408.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/33715608945.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/melizuvujiveje.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/23231443083.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/ziwudo.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/tibodavisoliregisowo.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/42084278007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+purge+2013+full+movie+online+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 10972 bytes
SHA-256: e10ce0616532bd210298c36ae0ff452fb2a48aebd28fb1bd1903fa252fda510e
font_02_sfnt_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 16840 bytes
SHA-256: af6c98bbfdd51fc8c6ffd05395b3186b728f3aa595c5a51c4f6e934e33f89f72