Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b4509f04123156…

MALICIOUS

PDF

71.6 KB Created: 2021-09-20 04:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9de3f72ddbc16ae9e6d4cff65dd8d101 SHA-1: 75ab697f8d49a86b1fb0d9ada9c55ce17c9e2007 SHA-256: e6b4509f0412315685faf294e20a65340f00091f414d21bbb1dc0a464df027c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, suggesting it is designed to redirect users to potentially harmful sites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm, likely for phishing or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=emoji+converter+iphone+to+android PDF link annotation
    • https://frigosztufi.ro/ckfinder/userfiles/files/tilad.pdfIn PDF document text
    • http://watch62.ru/files/files/zituwofilugerupejuvik.pdfIn PDF document text
    • http://dmkert.hu/files/file/filagiratagi.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210918_3D74C5EDC1BCDB0F.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f639df701---lirajowagesopovarezake.pdfIn PDF document text
    • http://freeski.hu/freeski/file/38364282137.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/narigaxulesi.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/meziwosevu.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/52670527280.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/388eb7fc72a5c31fafbebd31ffa20502/50184432013.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210917063117_pvadt1.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/29970834092.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/47075736911.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/rosarekamepetopo.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/kavujixik.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/3743153597.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/sepuvoduzikov.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/fozonosol.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/6119230479.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70934728814.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11687551183.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/kigunotan.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_off0000b767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB767 10744 bytes
SHA-256: 749d02e8a9be45fb1dd791ce10327fd5ca1980905e1c74a6c864b0c65884e6e4
font_01_sfnt_off0000cfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD5 16036 bytes
SHA-256: 77dafe5aa70954aae45a5f6c36e63c50d2c94d496d2cdfe24c1eba93284bde69
font_02_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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