Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1002b6e923a5f3…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 22:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1929e6375dd305ffbd3a1aca7dd1df91 SHA-1: 4b3ceaf463cd179e1c7dd64cb162d20ac9e01276 SHA-256: 6c1002b6e923a5f3b7894fe40814d3aa51a24bd93cd18f957fd8f278534b9aac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous external URIs, suggesting a phishing or redirection attempt. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point towards a link farm designed to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://pixomot.ru/uplcv?utm_term=cover+free+fire+strike+battle+net+encounter+ops PDF link annotation
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/73405930459.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/dujusimarovusibusanisu.pdfIn PDF document text
    • https://parfumzone.ro/files/file/dobisewewowokinemomoneru.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/voworeloput.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/likuzebexagofuruzuvugu.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/texel.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/guwubavenudovovi.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/jatiruka.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/pipesozusetagelorezofina.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/55725068824.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/93493ad93ddb88f405bc3bba9fa6424b/63318932086.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/bakuzonosurata.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/wofozusos.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/ruresikedari.pdfIn PDF document text
    • http://bronia.org/userfiles/file/foniwatifejetusi.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210913_094437.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/jevap.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/92586071809.pdfIn PDF document text
    • http://neteyes.eu/editor_up/64524449658.pdfIn PDF document text
    • http://etkenkalip.com/files/ridaxepeduguvekugunija.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/41816167596.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/bijixetaliroginoduxuguluz.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/9947881768.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/1852602566.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/mumumugokuvite.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630981260.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/6hbp5t3taierrnee94ng96sm24/gubezonizu.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_off0000cc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 10900 bytes
SHA-256: 4c10eb6f6ce31038addbdcce38fa7b17960ed83229d8b4b7f1290077e34ead34
font_01_sfnt_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 16836 bytes
SHA-256: b8dd7c4cd1269c601e6724c76127b9f807bb510b8ff0e69d1878463fd37b4d1a
font_02_sfnt_off000110ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1