Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf4814df9a8edf3…

MALICIOUS

PDF

82.6 KB Created: 2021-10-02 01:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d941b7ae2789825b2aad29165216b365 SHA-1: f909d6664ea0961749264bf0d181a12703d83cd7 SHA-256: faf4814df9a8edf30b2fb2150ef5a2b42879a88953f6fb916571b833395af2ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=kenapa+youtube+tidak+bisa+di+putar+di+android PDF link annotation
    • https://lamaisonducoeur.ca/upload/editor/file/xogunigaduxonefalorij.pdfIn PDF document text
    • http://canvangdientu.com/images/file/zanafelutajaregovagaxu.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/lujonimixewukikiju.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/28642318082.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/59078897007.pdfIn PDF document text
    • http://khocabien.com/uploads/files/97426091737.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/dizesil.pdfIn PDF document text
    • https://maria-galland.ru/files/file/11422598468.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/71291126854.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/97481389799.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/pinugolovabovake.pdfIn PDF document text
    • http://tercovci.cz/files/file/5896825289.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/dizebabe.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/23232ca7db21f3996283fc40eca9990d/22819160733.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/50752764087.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/bojenunosunabobilas.pdfIn PDF document text
    • http://helix.chuing.net/mai/ckfile/files/39855889675.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/54836436476.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/gezovodikuleregaf.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/gosutepadozofa.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5ed62e3beb31f41bd15bdbb64f8ec8e7/3909161825.pdfIn PDF document text
    • http://espwireless.net/uploads/file/wewepunoram.pdfIn PDF document text
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/99312228922.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_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 10776 bytes
SHA-256: c81f3163aa83daf2ed6e74110712c833f0726b0fd4c97ea22bdfd5cd901b2d3f
font_01_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 16488 bytes
SHA-256: b38be84f69156e1e0de472ce96d110dfcf1a069a0312337a1473c20b1825d8cd
font_02_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1