Malicious PDF — malware analysis report

Static analysis result for SHA-256 a620dabd1cf5e924…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 12:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d5525579782e6510c06885d286255b3 SHA-1: daec049b82a80d51e4b3c411f549a7ad9cf57354 SHA-256: a620dabd1cf5e924b63a740cb127fa773b4c668671d33e2b7817fc635182ff3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a tactic to distribute malicious content or phish credentials through a large number of seemingly unrelated websites. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://one9five.com/userfiles/files/94636135834.pdf In PDF document text
    • http://barrospizzadb.com/uploads/files/12834028408.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/95654590125.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/99312109418.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/tovexebevunugi.pdfIn PDF document text
    • http://immopolignano.lu/images/33228568738.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/dekofuzeki.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161301f1208d8b---44806934102.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/53603518894.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/5478811797.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/45046217813.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f5d5b8510---70092359271.pdfIn PDF document text
    • http://sdds.be/userfiles/file/rokokekamavojixavaso.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/72595164043.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/98193631163.pdfIn PDF document text
    • https://mbbs.hr/files/fasojelosisowepegeleruwow.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/19552984348.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/mepezazudavipuxuvumuriri.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-8/20210908052704225908.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/28491108091.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/lijurapubanulajiwazudom.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/ziposanajer.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/roxodeka.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/wuwokupizupovowupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fxguru+effects+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_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 17296 bytes
SHA-256: a691338f5e420edfb43c1505cf75acd5a3dcae5d466b7ea7ba00261c364a5f02
font_01_sfnt_off00011220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 10824 bytes
SHA-256: 3b96160d577f7cf71573d1266eda22825cec863a8945c4dbb7a490cd76a16fd4