Malicious PDF — malware analysis report

Static analysis result for SHA-256 909f0f550a0bd8e4…

MALICIOUS

PDF

67.6 KB Created: 2021-02-02 01:21:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8eb3c941fda3fd692ca9b18e927c3c91 SHA-1: a1471c279da62a2328b18417e6ef97a00e8a82f7 SHA-256: 909f0f550a0bd8e4693f6814059d4dd4cf4cca7e65f130e007690ba824f0a5c3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to search queries, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=real+estate+lawyer+salary+new+york PDF link annotation
    • http://kwini-fini.online/nikon_serial_number_manufacture_datebxdpq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412895/normal_5feeb1dab860d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456116/normal_5fffce3f5d9d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456391/normal_5fdbab854d9dd.pdfIn PDF document text
    • http://raxaterov.iblogger.org/4284357338.pdfIn PDF document text
    • http://cartest.pro/wexixiritigitepibe0fk2y.pdfIn PDF document text
    • http://sushibara.net/double_clutch_lure_95ml87d.pdfIn PDF document text
    • http://naturebiolog.fun/bus_rush_2_free6gogt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502567/normal_5fcda33561964.pdfIn PDF document text
    • http://pudumalezedokav.22web.org/6372409158.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/jadepagamovagagegin.pdfIn PDF document text
    • http://rutotonofawe.rf.gd/yesterday_piano_sheet_music_free.pdfIn PDF document text
    • http://fonobufusig.rf.gd/android_sdk_tool_setup_exe.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/77660695601.pdfIn PDF document text
    • http://pazizota.rf.gd/family_tree_website_templates_free.pdfIn PDF document text
    • http://jelemomibupu.rf.gd/vazonafevuvimexisumil.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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB59 4944 bytes
SHA-256: 1cdb96fe916a910dd3d94dac75fcf3e1b6598d78a13678ce19c9df25a9de3f39
font_01_sfnt_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 10880 bytes
SHA-256: 39da8a864be3c418da9aefb410f87092845f5ff777ccaa13740eb832b43e12b7

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