Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f4a60b6bdfd1b8…

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 18:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bcd613b9e0d9bf297a9b30556373c58 SHA-1: ecb2dc7a0565f113420b3132b0f77465363a9b9a SHA-256: e3f4a60b6bdfd1b8932777b09b1e4e72cae4cd3d07bff052c170fc611f8fdc0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely involving a client-side exploit or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://mtmnetwork.net/uploadEditor/files/42090653594.pdf
    • http://hondaototanan.com/upload/files/xapakirapenol.pdf
    • https://maciejabramowicz.pl/upload/files/file/52270685761.pdf
    • https://czus-lukasa.sk/userfiles/file/3799125423.pdf
    • https://cjsc.se/ckfinder/userfiles/files/97071416708.pdf
    • https://promenade-perpignan.com/userfiles/file/91484458709.pdf
    • http://www.icareonline.net.au/ckfinder/icare/files/gobilotariwurumobi.pdf
    • http://halongwave.com/userfiles/file/kogawilar.pdf
    • http://abcbyspu.net/ckfinder/images_store/files/75081038539.pdf
    • http://skupka23.ru/upload/m/98948173033.pdf
    • https://mepho.hu/ckfinder/userfiles/files/28086179389.pdf
    • https://kligi.viart.lt/ckfinder/userfiles/files/58286594375.pdf
    • https://pointwebhost.com/calisma2/files/uploads/vikusemevudojifepitep.pdf
    • https://semsaesp.com/ckfinder/userfiles/files/fepugevamajefedinukeb.pdf
    • http://gamboeng.com/assets/ckfinder/userfiles/files/bobuxu.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d80e41e5d7---90465236999.pdf
    • http://ultrabeauty-ff.ru/userfiles/file/71131536889.pdf
    • http://happy-land.hu/editor_up/73660167027.pdf
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/wewonez.pdf
    • http://gbfrjournal.org/pds/userfiles/files/82552954477.pdf
    • https://tempatpasang.com/contents/files/guxepisemegevusonalo.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613027a5c9496---vipufu.pdf
    • http://rasmesafar.net/basefile/basefiles/tudefiwivezugupafofatigel.pdf
    • http://pokebarslo.com/uploads/files/gudevuganep.pdf
    • https://natanashoes.com/kingkong/userfiles/files/33105410491.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=thoptv+for+windows+10+pc
    • 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_off0000eef6.bin
9e9357a35bf6983172ea2e5fe2b9477163ac3f0e9b5e2068935494954c61a7d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 18136 bytes
font_01_sfnt_off00011d59.bin
a6ec89a16d2e2e00115a85ef2746fbf42587942455a942178f35d081de0d2cb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 10668 bytes
font_02_sfnt_off000135d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135D3 16792 bytes

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