Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17e637b72f30f80…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 20:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3a7354e5a46d91ca7f0c7ed586a73658 SHA-1: a83abac9aa1e79ce0659cf222c84f1ee13645d60 SHA-256: c17e637b72f30f802412a1f3c6645178367236cf2b6e75d6fb33a0ce5b867bdf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs with UTM parameters further supports the lure of a fake download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=minecraft1+16.40+download PDF link annotation
    • https://chilegastronomia.cl/uploads/userfiles/files/10574278534.pdfIn PDF document text
    • https://breedlife.com/upload/files/52704741250.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/91604831171.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/13712360988.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/tedotafowuror.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/mujexupafipevavodero.pdfIn PDF document text
    • http://artdental.hu/editor_up/14769892703.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377f0e72427---piwizetajumibiduj.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/83946075715.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/xanajevej.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/55482819540.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/wugeber.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/jagotulitopapix.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/73699580295.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/73505583384.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/tenorogojowar.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/92710215522.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109031949489953.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/juzexu.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/kozarewaromikibavofedi.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/86822669068.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/zopodiniwis.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_off0000dd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 10868 bytes
SHA-256: f0b435e329793e41dcbe52e6493597b670414612975e2bcf900a23d534cfcac7
font_02_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 17956 bytes
SHA-256: 607ac85bf80680c2b015fa748fe6082a966298f489f60cf34aef61ac8641afbe

Open this report in the interactive analyzer, or submit your own file for analysis.