Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5e14df4746c397…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 08:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d76f75bb9cd174f138fb9226a7c5b629 SHA-1: 04834e49d7388cfde4b1207c4e95742ba69a362d SHA-256: 5a5e14df4746c397a5f44e607f3227e45d7d6ba22bda3d6dbfff331742ea3e74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://cructi.ru/uplcv?utm_term=kings+of+pool+mod PDF link annotation
    • https://kaptenhoki.com/contents/files/xasimupawov.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ngg8gc9n2vbuc910asepm9dgkg/lemefi.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/87967850774.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/64047328261.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/bekilefebinukolux.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/zotatixasilefajoxesafabav.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/pugavelela.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/63929338656.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/xaginiwimugalurej.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/fofelugusogib.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210911_163304.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/sutifipusew.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/68578345755.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630489487.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/sutel.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/69798655172.pdfIn PDF document text
    • https://steammining.com/userfiles/file/femajaxa.pdfIn PDF document text
    • http://iltorg.ru/upload/file/zoduvokesudotoxuboxixix.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/76042472090.pdfIn PDF document text
    • http://15881588.com/ckupload/files/nulowogifugidibojodevubo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c67f1c9e8---14063266537.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/xakamoduduxu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/zotoxavepub.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/79034557719.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210912081757.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_off0000d225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 18400 bytes
SHA-256: 9cca0b9a114dee8ca4da603811393df90868253d42cf5a2d6325e156bc3bfa0a
font_01_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 10340 bytes
SHA-256: ddf1e9e222f67672df1913ddac5f5283e9fc5f46ab29321f09ae6d99beaf50d0

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