Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7adfe5be3d03c58…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 03:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 40ba1d39eb1d8c26829db4427906dc66 SHA-1: 62f1e61969ab3f12d7738fd060673a2c104beb92 SHA-256: c7adfe5be3d03c5851c65bc0db18bcc937eeed6e9f4ca2eafa64c3cf8c26eb1e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous links to external PDFs hosted on various domains, many of which are identified as a link farm on disposable hosting. This suggests a phishing or malware distribution scheme, likely intended to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://imhome-listings.com/userfiles/files/51441386755.pdf In PDF document text
    • http://geodez.com/pliki/file/noganodeloda.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/11463039803.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/44552754006.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/porigodi.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/61345983501.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210905014836.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/10682864907.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/46233241874.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8a55c9541---palekazolopisetisel.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zuvonifozelakegamod.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/49120574335.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/wupofexexitimuwalu.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/fajed.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15344747276.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/wukerumiwaxibuwuj.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/30119975111.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/dinavuxozatosun.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/50547805976.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/14636760378.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/32445667182.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/pudevojufafef.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/40235791054.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/12261080260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+gps+tools+for+androidPDF 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_off0000d3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 17184 bytes
SHA-256: 2b73b8bf0a7f0a09a452aab87f507a520f8d5752502488fce753d5c33d577266
font_02_sfnt_off00011863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11863 10728 bytes
SHA-256: 6829af2c4e2fd6b7cbecffb557822537ff769ebd9ee87f1481499d5dd67ca901