Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a416aaf5b822a32…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 14:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1700a2be64ad8cda1804a4c3769b185 SHA-1: 52aa25ebabfbbb7d77ef80ecef40af79d5baada3 SHA-256: 6a416aaf5b822a329887315263ddcc261913922df68ea4f37cbb4d0c649596ee
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, with one heuristic specifically flagging a link to an algorithmically-generated URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely facilitates the redirection or execution of further malicious content, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.egavilanes.com/ckfinder/userfiles/files/widex.pdf In PDF document text
    • http://encino.ilovepokebar.com/uploads/files/94015044617.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/jadusuzu.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/kilezafirixorafowosusib.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/dukosofopadijuk.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/40359634754.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/84780100906.pdfIn PDF document text
    • https://matratva.in/userfiles/file/66296811970.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/ribukifetisivemaxibagaf.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/tifalifonifagenefa.pdfIn PDF document text
    • http://exima.kr/userData/board/file/81437497066.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161329ff34a1ac---94821626875.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/sikikusit.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/tigovubekuwumep.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/37704928846.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/xixeradonufefizikore.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1387723828613052a7e943d.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/xebizuwixusevomabuna.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/xoxesu.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/80446830374.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/92720339316.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/40821576191.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/kevuvenafedunivefifa.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/76764949993.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/vazufekusidijonusomotiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+unlock+patternPDF 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_off0000c5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F0 17000 bytes
SHA-256: cf392dae21fe71742be2e9e6266a171845afffc601b509c25dcfbeb2f3af0350
font_01_sfnt_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 10376 bytes
SHA-256: facaa5634f65a7dbd65d0b8e0dbec4220536cd11120a69dfba6c60f2ce002abc

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