Malicious PDF — malware analysis report

Static analysis result for SHA-256 e089bc84a2e612a9…

MALICIOUS

PDF

88.4 KB Created: 2021-09-09 03:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a37bbfe781e9e5a364d4c4aec950efa3 SHA-1: 0f4687c14b02b1c1860704769ed5071e9f0074d7 SHA-256: e089bc84a2e612a966e63da09be5612578c00e0099b237818f8f4357fac0d60c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a link farm or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a tactic to obscure the true destination by using many distinct, disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kolkatanagariksammelan.org/ckfinder/userfiles/files/kugebulor.pdf In PDF document text
    • http://chukysovin.com/img-svc/files/88055877090.pdfIn PDF document text
    • http://insei.eu/userfiles/files/fetudubaje.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/79228584164.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/najuxafigasuwo.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/wivuwivezokawinunemiko.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/xozot.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/manubogekezenekegelezu.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/fivevipejajijizoregide.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16137901e47ed6---mijuwabaj.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/nemofer.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/35968976633.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/silabivew.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210905_DDF3D1994CB7492D.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/62286117526.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/69483739848.pdfIn PDF document text
    • http://jawarakreasi.com/file/zozojaferovumabenubigegas.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/36681498854.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/87112878514.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/59033257881.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/27508714963.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356b7d97fbd---geketufejoru.pdfIn PDF document text
    • https://claudiodituri.it/uploads/dububavosajonokisosasi.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/padudipalaf.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/birovorabobon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=demon+slayer+mugen+train+moviePDF link annotation
    • 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_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 18304 bytes
SHA-256: 11ff9870cb7990b1eed4c5beb8c62c3586c87edf06480c89fd4e12d5f40b8079
font_01_sfnt_off0001217e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 10732 bytes
SHA-256: 47beff4de980ca94b786b7f894011412deb9c11d39441b54f684737235bdad2d
font_02_sfnt_off00013a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1