Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38794364094bdce…

MALICIOUS

PDF

79.5 KB Created: 2021-09-21 14:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d2a06c70abe2d14fb6f0e0ff51065bbc SHA-1: d57be2bc0b1780955f933a43fc627407a953ebea SHA-256: f38794364094bdcea84d1e617d4836d335a83c25c30d8b9e29ab481aee68b07a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, despite some being marked benign, point towards a pattern of redirecting users to potentially harmful sites. No scripts were extracted, but the overall structure and heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://olgunbey.com/upload/ckfinder/files/52910310058.pdf In PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/14731944624.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/48492628210.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/fefikisifivi.pdfIn PDF document text
    • http://mi-stores.com/basketballtotaal/images/editor/file/77030181524.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/mujobojopagidani.pdfIn PDF document text
    • https://ekransamara.ru/files/gibufiga.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/36850718720.pdfIn PDF document text
    • https://luminex.pl/upload/file/petudubasesopazip.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/duwonukopaxu.pdfIn PDF document text
    • https://clickbox.ro/images/file/dujigajimidamojetizesox.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/17338780476.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/59830983290.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/kevimapu.pdfIn PDF document text
    • http://mdtrend.hu/files/file/88597184331.pdfIn PDF document text
    • https://12waktu.com/contents/files/83227776794.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344ee24dc9f---wirola.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/kudarariwu.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/43649924541.pdfIn PDF document text
    • https://thehealerspoint.in/admin/userfiles/file/98054110593.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/87697616259.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/kakinimupepeveziro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lyrics+of+paranoid+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_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 10408 bytes
SHA-256: deaea0219e82d8ca9f54b8b763772a4b3a060025d93d04901a3fafdc93c1b794
font_01_sfnt_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 17372 bytes
SHA-256: 61664053f03c53c2cfe228f0e50d2c30b04140937ba6714d6834345330a938f5
font_02_sfnt_off0001187b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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