Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a9fd4fd7fbdd71…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 05:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8de33c15068fb3b653c35003f5eef3f8 SHA-1: 86edd526ce6745eb640f25d8a997b3dddd8e7fc5 SHA-256: c9a9fd4fd7fbdd71ca396b2fbc14d32aa474c6e005328d76d2fcf579f7692dec
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, including one to an algorithmically-generated URL, indicating a malicious intent to redirect the user. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://carrasvilla.es/uploads/files/pedatasunu.pdf In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e2841fd1c1865c1150b7174eda9d940b/wenose.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/90150449277.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/66539478737.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/fufuwasoxagoruwudi.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/naxopixufo.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/jugixib.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/42406269394.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/45877082014.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/xifixetuduliwexajodu.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/solulojemopo.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/57269188415.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/89992755435.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/vosetibonugubotefumapaw.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/vavosaxafi.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/513658613.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/zemoneluvitororasu.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/83461942253.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/52865153625.pdfIn PDF document text
    • http://air-con.ru/upload/files/11800571456.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/98741998143.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/buberomalasafukuxugowos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+save+phone+storagePDF 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_off0000aff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 10536 bytes
SHA-256: 094dcebc3c8811aba329d0f158f324598b8caedba89b35aaad6fca4ede6d4246
font_02_sfnt_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 18692 bytes
SHA-256: 63b2d681ed0e481fba6104ae6a7d19a12278e36aa1c2c0b00f8a3363771b0738