Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c259220c5c5221…

MALICIOUS

PDF

92.1 KB Created: 2021-10-04 22:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0fa2d624ce4c8872772006e720ae2c05 SHA-1: 272952e191c5aa5d6532efef131401a5f8d25c91 SHA-256: 25c259220c5c52216e7fcff283fcffa9b040cb1e02a47f89c9281bcb53d5ad32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The primary attack pattern involves directing users to external websites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://infrive.ru/uplcv?utm_term=empty+handed+meaning PDF link annotation
    • http://fields-on-earth.com/images/blog/file/jipajopojerezeli.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/xixaj.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/rojilerozonaraxigixaza.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/90172033384.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/59801807432.pdfIn PDF document text
    • http://watch62.ru/files/files/tojisopeluwamerakidetor.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/37561984935.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kajenerokabukelomi.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/35775889535.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/97647252305.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/24630390145.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16158df7207574---85282882528.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/57863358350.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/54611775039.pdfIn PDF document text
    • http://safetruck.gr/images/file/fopabovasanutituleporune.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/kavejunaxo.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/xidinife.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/vopejimorabixevopivo.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/falekanusutifokivatubagi.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/25868621826.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/risafujoliparafuna.pdfIn PDF document text
    • http://ashioke.com/images/library/File/suzumadukajuzebuw.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/40802217578.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_off0000fbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 10504 bytes
SHA-256: a2e72f3d94d8f0a3b8371cd698af0349937c0de1c2de259671bd4dba97d35b09
font_01_sfnt_off0001131c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131C 21688 bytes
SHA-256: 20d8888a090e3e88f16388bee059fd8beab5aab7801f4843e51a0bb68f16b01d
font_02_sfnt_off00014aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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