Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f027b334c79638…

MALICIOUS

PDF

86.8 KB Created: 2021-09-13 02:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5326410c02a7561a894cdcd701142ce1 SHA-1: ecb0508a3b285375cf9229c01f3f8f1246b0e03f SHA-256: b6f027b334c796382cb7b3a21d3c17c2112e107f30e37f9449fb0a9442da45c1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high-risk heuristic firing for a random URL link, indicating an attempt to redirect the user to a malicious site. The ML classifier also flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bbox.ru/images/shared/file/4170528362.pdf In PDF document text
    • http://zamdq.com/filespath/files/20210913074412.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/51901234672.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/58625400017.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de96b28de1---favedo.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/35381413797.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/xeduv.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/teposuxutusiti.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/gotufewodurujetisoxama.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/nodajuxifisepatoro.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/wotivemewazugome.pdfIn PDF document text
    • http://sbkf.org/files/files/peparaliza.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/67197417243.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390afe8d2f5---didamebotaxonewupej.pdfIn PDF document text
    • http://juncheng.tw/upload/files/82230692120.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/bumawirixirujebuxijupizo.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/refesole.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/81347881583.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/dozaxesuwujofomozag.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/30968138043.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/30805313297.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/kuvesumirarojoxidena.pdfIn PDF document text
    • http://dgkno.cn/upload/duvusalikodudap.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xapunir.pdfIn PDF document text
    • https://hinaweb.com/upload/file/xuxofovujeb.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/filidepupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dnd+character+sheet+pdf+editablePDF 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_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 17740 bytes
SHA-256: bb495fb994931f5f03be9b9f25cd4c43d5207ed7a73b4f2905ab08b9718651fb
font_01_sfnt_off00011d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13533 10736 bytes
SHA-256: 13dea9970ba21399657604a2181b50742298167019dced0002553fafdf82e855