Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b88ea1933cc481…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 07:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b116b3ca001782d0c429247779c2dea SHA-1: 6ec14215eb2bd213e819bf962b08eae815455184 SHA-256: f0b88ea1933cc4812d4d8700f2b2f3a90af02380b7a18533e88a2928e52892fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to host malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://hostsolutions.ro/app/webroot/files/userfiles/files/serakavexuka.pdf In PDF document text
    • https://buyafranchise.org/files/files/36367521386.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161328cd376cf9---68456530318.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/nizoxorepuzu.pdfIn PDF document text
    • https://miet.hu/kepek/rolunujilewotedukimo.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210901070501.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/wogixakixuxobulukawufave.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132a64a3e0a0---98057937012.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210906015240.pdfIn PDF document text
    • https://kar360.com/resimler/files/zaroxaraxusisijikukabivu.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/18527398617.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/1602545468.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/raxisuk.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/wusedaxunivisabedudu.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/xebukogivejumosex.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210907_8367025E3A926160.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210902_4671A7DCCD78D289.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/13546959277.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/75564103920.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/54540848328.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/18349440933.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/kegikutilorudewabozarenuv.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/6781424463.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/derenimuxenuwotetivewi.pdfIn PDF document text
    • http://119pump.net/d/files/vixukeranezoxodop.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/gininufojotakavenoniwogan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=redmi+note+9+stock+romPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/23774272574.pdfIn PDF document text
    • 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_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 10628 bytes
SHA-256: 3c45dd2bc0dbb8a90d0f8dca56e312375c4f8f0492236089ddbe4274a2be4c3c
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 18384 bytes
SHA-256: 4809a4d4c15703a1722d5b1e2a21dc258485c24df707bf519b06de1695365963
font_02_sfnt_off00012cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1