Malicious PDF — malware analysis report

Static analysis result for SHA-256 4459808dbc3f64af…

MALICIOUS

PDF

73.3 KB Created: 2021-10-06 17:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: b2c81d427753fef5dbf3e936dbc1d95f SHA-1: bb107b3eeb5b8d7b0dc3ee74df9d47be9e18c2a8 SHA-256: 4459808dbc3f64af8fbb1e27310f2a5e7b24695f3a80a36404bd3c9843d19fc7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains and appear to be part of a link farm. The embedded JavaScript and the external links suggest an intent to redirect the user to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/uplcv?utm_term=cheap+thrills+mp3+download+320kbps+pagalworld PDF link annotation
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/56708947879.pdfIn PDF document text
    • http://allergyc.news-read.com/upload/files/zoxopib.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/90750037045.pdfIn PDF document text
    • http://retailcop.ca/files/59822227556.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/puxudowijitobaludutupaxi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7cfec0da8---mixobijuwonofijukozapo.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/razomamekizu.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/54396112484.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/negiwizawisuxiw.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210926_A6867957550B6DC4.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/nebobab.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/16549301546.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/limevixed.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_off0000b3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E8 18552 bytes
SHA-256: ecde0f7d7cc23989ea05e0de880726a7b0000e636f2d989afae8afd5993933e7
font_01_sfnt_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 11600 bytes
SHA-256: 08ddf19b4a36518f2b097ac722ed84b122b7b87e1fe4dc6de9ab8d23281c3d0c

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