Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a4cf84421c3587…

MALICIOUS

PDF

83.9 KB Created: 2021-09-10 12:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0ba2892529f2dea1e0fc7ad71b45e5a SHA-1: fc93ebeb9c097fd3282e62ce1d2c461981aa48e4 SHA-256: a8a4cf84421c3587e8d2e8c91951fae35f03a0af3553ec4d3711e91e4f7eeeab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ctcitsupport.com/media/files/40365425968.pdf In PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/43024491750.pdfIn PDF document text
    • http://electric-kernbichler.at/81785433230.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/nabokozigen.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/5146347964.pdfIn PDF document text
    • https://andana.us/files/files/nopilib.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/84997480377.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/lavipi.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/kezitelizatixapekixuril.pdfIn PDF document text
    • http://philboyd.com/9715066332.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/18480623483.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/36634994220.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/fororufunifijepuzemi.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/bujowowabak.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/todekusuvu.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/34377804187.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/nanezixagusubemolimeluno.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/mudodezonawukusip.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/sanukopofele.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/wokezadeximuxorekepesaru.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45df6a345---59996202174.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/94108637436.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/barosaruranisipanoruzon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=expo+app+androidPDF 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_off0000e4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 10024 bytes
SHA-256: f803716a595b1df93a58d1fa0e18b807f3795ef2a33524dc08a2eaa5bde4c8eb
font_01_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 18280 bytes
SHA-256: 64af4a07b1ebe6b6fab420363fd9dc726fe12ca62fcaf6f0378c9c39cca66414
font_02_sfnt_off00012a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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