Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ccb56dec14a681b…

MALICIOUS

PDF

70.6 KB Created: 2021-09-13 18:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 038190c8adcd2ad783dfd9934d2bb21f SHA-1: 502823593870ead203b25253806e90d33ceab0a7 SHA-256: 7ccb56dec14a681bed7d1c8ac6e1836dfd4eb963261bb9040ed15d6168682dd1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While 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 0.9975

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://dalnoboy.com/data/filestorage/upload/files/vimogemojugudonef.pdf In PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/butasibikoj.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///xadurolapiziju.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/84947229383.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/mujibibonugos.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/jitimiz.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/42993256163.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/nerabixuwuvuvemawikolo.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/fefoxalid.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/ninexonotulatuvigiruriwuw.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/nagojodewosobulijav.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/pujagak.pdfIn PDF document text
    • http://airsoft1.ro/files/file/jitukarimaduwidulaziwax.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/zokozim.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/fibugafatamapofesasapa.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/bonabulekojimosej.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/vosajogimeronubu.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/zenareremitixixutavax.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/sopekimanurufibe.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/bavemo.pdfIn PDF document text
    • https://polandpools.com/contents/files/6629791610.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/25142663957.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/ribimodonagigur.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/kelosofumanolegodeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=crash+bandicoot+remastered+downloadPDF 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_off0000b368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB368 10892 bytes
SHA-256: 1327bc39d43323bf8b2f4b4c0738129920a82cf28e93828e530c7efd0de8a895
font_01_sfnt_off0000cc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC77 15668 bytes
SHA-256: 5a4f9df728693ddd7d6d5d468264289779ec7f14d9464159635a516d26473d45
font_02_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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