Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cbaa7586397486…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 07:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 110ff57e6d33450be491ae9f7e597cbc SHA-1: fd3df902c465fabc8a6113d9587f7ff07d58f1a4 SHA-256: 80cbaa7586397486962845419ca69a3609ba2c2f82826dda0b867d7823c0bbc9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a URI pointing to an IP address, which is a strong indicator of malicious intent to host or redirect to a malicious site. The presence of multiple links and the structure suggest it's part of a link farm designed to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613c220d8f85a---99922800829.pdf
    • http://myapartment.de/web/editor/files/guzonunowegubumiw.pdf
    • http://delfosventures.eu/userfiles/files/setanasepoluge.pdf
    • http://jinyudachem.com/upload/files/wewugezeka.pdf
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/12417026467.pdf
    • https://hongming-eco.com/userfiles/file/52452406057.pdf
    • http://thebookmarkcafe.com/uploads/files/47325922168.pdf
    • https://luxm.pl/userfiles/file/42560190744.pdf
    • http://cellesekorea.com/ckupload/files/nedazopanetubibewa.pdf
    • https://afgventuregroup.com/cfiles/file/91295137184.pdf
    • https://satellietgroep.nl/userfiles/files/fokodobukagowoxejudo.pdf
    • http://jumpinfit.it/userfiles/files/44273391235.pdf
    • http://sanraimundo.cl/dyn/uploads/file/45345088869.pdf
    • http://istanbulballoons.com/ckfinder/userfiles/files/zewevupagapuzaxi.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/80565030569.pdf
    • http://jjc-dev.com/userfiles/file/60440657837.pdf
    • http://adice-area.com/pictures/files/33189640165.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135599704383---kopiw.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321525a6f4f---67918270535.pdf
    • http://gr-chem.com/upload/files/41062450117.pdf
    • http://mskgroup-spb.ru/upload/file/65205703181.pdf
    • http://launensia.cz/ckfinder/userfiles/files/woxosi.pdf
    • http://futboltotal.net/images/files/zetukugewulawifariloked.pdf
    • http://novichiha.ru/pic/file/19177999273.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cheat+monster+legends+gems+food+gold
    • 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_off0000da3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 16792 bytes
font_01_sfnt_off0000f256.bin
dcde68f0c028cc2dd764c8517b1148c61f75c57b90b8fa669fd2b3b122a90a69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 10740 bytes
font_02_sfnt_off00010aa8.bin
15fa9556a9ee826f874c97d0018abc797a508b73b5769e130a8e63ed62994df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 17572 bytes

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