Malicious PDF — malware analysis report

Static analysis result for SHA-256 b341a854f1491def…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 05:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2176a8a8d35a19eb59f776d4a7f396c9 SHA-1: 9289e0f0f0b513ee8c2568cd43edd9f23f31d2b0 SHA-256: b341a854f1491def20c2792282a18597ba701e6e4dd441cf37b9650e84790176
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Numerous embedded URLs point to external sites, many of which are PDFs, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links strongly indicate an attempt to redirect users to potentially harmful content.

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://irlanc.ru/uplcv?utm_term=redmi+note+9+vs+redmi+9+prime PDF link annotation
    • http://dsraxys.com/uploads/ziwofogufo.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/514023923.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/sokewuzefakezitiruvol.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/98063964903.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/xapuzekiroxidu.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///83058129141.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/jewulegilimonilazel.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/41630232626.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/88421724538.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/16919637794.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/zemaxorew.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/58613996288.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/17202260443.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/xifusikim.pdfIn PDF document text
    • https://mauspro.net/upload/files/jevitujewivibesogin.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/zamopetowedijazumabi.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/66889999291.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb89ac31a---83875573829.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/95248123602.pdfIn PDF document text
    • http://tykhchem.com/upload/files/vezarazamuguposewozavim.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/laxaramevinomaferovevob.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/39677411568.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/tirozikowobiji.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_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 10624 bytes
SHA-256: dda83a53eedb6a464bfb02996b4a0fb64c73c616eff7917cf12ffb184aaf8a64
font_02_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 18856 bytes
SHA-256: 5b87c2b51c34289c86066c8c5649a9af317310e86af1640382b9caae2077544f

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