Malicious PDF — malware analysis report

Static analysis result for SHA-256 2857d7960d990394…

MALICIOUS

PDF

70.7 KB Created: 2021-09-19 21:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f4f78bff5f492df85f445dab4705196 SHA-1: 4943350aea45620ff50b7a0d0559909d8a4a4fd1 SHA-256: 2857d7960d99039453c79c43b5477b3ad424d5c388007cee96cedbc8a4727f76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics identified it as a link farm with numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=bromine+atomic+size PDF link annotation
    • http://proart.by/media/file/vixufonoguge.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/43875702762.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/viwuvi.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/88493981362.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/67546757710.pdfIn PDF document text
    • http://bienbao.org/uploads/files/80413768571.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce37944e2---ritevedij.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/tizexujofisuji.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109020210534165.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/zagelidumojuv.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/vapoponojuve.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/dababotamopelozev.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/devoxazotodadu.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/16726446358.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/25456803179.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/56599721411.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/31487466239.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/91626824047.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/vilaganufajumuperafafi.pdfIn PDF document text
    • http://apex-architect.ru/images/file/42621500152.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/33288465852.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf56ea503e---59354488559.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/noporusebegija.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/ziworemikilopubo.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/gebofarewu.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/renofitebunutamal.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_off0000b433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB433 10460 bytes
SHA-256: c43dd79a66dcf37b7da6ce26667fe7cd0941bea65f7b370787a5f7a85fe02c38
font_01_sfnt_off0000cbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFC 16244 bytes
SHA-256: f0a794554be9ab578d125b4ba7458967a9bec1c0b0d61ed334b8fe998a0a4a7a
font_02_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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