Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e982bd114fa54a…

MALICIOUS

PDF

74.3 KB Created: 2021-09-21 16:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2548cbb42242aef4323224fbedea8d9 SHA-1: 306ff2a40316e8a7f3a5d6fb834e4ea459883dbc SHA-256: 27e982bd114fa54a7de1c4afa18831ae2855a9cb19a6d795b9e78ab498ee3796
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://yuc-fac.com/uploadfiles/20210919102139.pdf In PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/16790244246.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/42612203976.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/furefulevevedijugeboxaxim.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/35813755776.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/77665388604.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/29858352636.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/besezazezaminazi.pdfIn PDF document text
    • http://packamate.com/userfiles/715611082.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/zimat.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/73957143763.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/52267882315.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/bunifufivorufolokarexil.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/kejosejugumani.pdfIn PDF document text
    • https://funbugs.ie/files/file/mosexomi.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/79417850016.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/fazifuvafifojuzosib.pdfIn PDF document text
    • http://hongdacable.com/d/files/dotipabenidogimebaloj.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/jeveniturimijojibug.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/4682494003.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/vubiraxawejumexamapitelen.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/bekesavumiwebagi.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/tutivawiviwodomijunos.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/kizumevusuzam.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/xadif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+write+address+in+envelope+for+speed+postPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/pufukidunokevo.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_off0000bf81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF81 10632 bytes
SHA-256: baed483a2240525891b6c245ede6413febbe4f0da6d491356f1bcae49a13e01d
font_01_sfnt_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 16660 bytes
SHA-256: ecc03f7433ddb61cfc6ccbbbf783196bc5d0bfaad4a27593bd011a2304282de3