Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dac369b83b5357c…

MALICIOUS

PDF

75.7 KB Created: 2021-02-24 22:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 6d12a08f926e031d8743a531b9ea7390 SHA-1: 4de76c4927871e861e03926c702ef2a7110de160 SHA-256: 4dac369b83b5357cf64a35e1c9056fb6b4928dbc051a99a4ef4209e8f543d329
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, appears to contain metadata related to Netgear manuals and wkhtmltopdf, likely as a lure. The presence of numerous external URIs indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=netgear+prosafe+plus+gs108pe+manual PDF link annotation
    • https://nububoreral.weebly.com/uploads/1/3/4/4/134467099/2376104.pdfIn PDF document text
    • http://good-production17.site/65157096997a47zc.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/j7KBieI/96007946170.pdfIn PDF document text
    • https://cdn.sqhk.co/towojutal/LAheifw/68443792045.pdfIn PDF document text
    • https://dijekoko.weebly.com/uploads/1/3/5/3/135315120/petomo-wakagewos-jasigujur-putuvesinugipa.pdfIn PDF document text
    • https://vejazejama.weebly.com/uploads/1/3/1/3/131381369/6611180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_5fd79aadd150c.pdfIn PDF document text
    • https://xegezegev.weebly.com/uploads/1/3/2/6/132683484/81b7571a98.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/hjeGCia/doubly_stochastic_matrix.pdfIn PDF document text
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/7790878.pdfIn PDF document text
    • https://xusalifur.weebly.com/uploads/1/3/4/1/134131705/kixixexafax-kofexese-taxajekaruka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pivirujifija.epizy.com/free_2019_calendar_template.pdfIn PDF document text
    • http://vukekabexipog.rf.gd/how_to_tell_if_a_binary_compound_is_ionic_or_molecular.pdfIn PDF document text
    • http://bejuwenaja.epizy.com/70444133678.pdfIn PDF document text
    • http://gikasabedadex.rf.gd/the_magic_flute_queen_of_the_night_aria_english.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 5576 bytes
SHA-256: 97de17e9a1aaf5dd5f46674346e43121953512f81ba0f2f97366e8a83a5ca286
font_01_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 10780 bytes
SHA-256: 3aabda0373cc26b76ef46b0c0f00b80027a4153f82dfc53c0aeeb8c62daaf4ff

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