Malicious PDF — malware analysis report

Static analysis result for SHA-256 928612c8dac2a7f4…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 15:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6e64ab3bd431f7b33207dc14848c8156 SHA-1: cd977845781dd27f41bc2879cca5cbb375be2afc SHA-256: 928612c8dac2a7f4e93bc9c80eedbcd13ad7a4ec5d5dd60a05be7f8ebf2d9830
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://imdad-egypt.com/userfiles/file/newivabu.pdf In PDF document text
    • http://collectifff.be/imgdb/accueil/files/69174687659.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/72420003735.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mowizepojugevasoremogazan.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/lubafaboluwawedow.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/sosabifef.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f08f89426---47500158447.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/90756563238.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/ziwujometopunuwosedewogux.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/zasamifejemido.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/nalubulusozanapevuvejik.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/38700056466.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/jakeketatef.pdfIn PDF document text
    • http://akademibt.com/resimler/files/xunosexasufivuvunoji.pdfIn PDF document text
    • http://protok.pro/upload/files/tegikekexuzopoxuguj.pdfIn PDF document text
    • http://rentaruedas.com/files/others/tigekaziwomitafadenedi.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/75312734752.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134d3d1dfda5---74491411678.pdfIn PDF document text
    • http://aa-nusd.jp/68450417541.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/tutopuladuzeligupagoxuwi.pdfIn PDF document text
    • http://i-physiology.ru/upload/42101891895.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/didefatasusikojunolu.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riremokuman.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210905_A2443C91B533914E.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+camera+save+to+sd+cardPDF 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_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 10532 bytes
SHA-256: ebf7918af9947e46e50d093406a95b8a23a07743caf06a4cc61e4905e28ee22a
font_01_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 18048 bytes
SHA-256: 9e48e38ae0331beb74968d11c3ad38bfc0650b29b604031d6cb2b4db526dcee0
font_02_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1