Malicious PDF — malware analysis report

Static analysis result for SHA-256 8491dd31d226aa31…

MALICIOUS

PDF

79.6 KB Created: 2021-03-29 17:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d54aa609314492253f20d08fa1ac2281 SHA-1: 482d3e0c6ab0f431c31c9bfad3e3975f8efdc123 SHA-256: 8491dd31d226aa31a496bfeac4bc9237cc41a178b97d8c999e085693effcc9ba
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL indicates an attempt to lure the user to a harmful site, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=lake+eufaula+crappie+fishing+report+2018 In PDF document text
    • https://cdn.sqhk.co/vimerokil/hhvidij/69330402160.pdfIn PDF document text
    • http://memokepudag.iblogger.org/86400364309.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/55hgCQ2/metal_world_map_with_picture_frames.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebosatu/REzxnaK/16734252348.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/bs1mggk/binive.pdfIn PDF document text
    • http://nelezoroga.22web.org/72744893178.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/Prv4hfp/numogomi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dda61e2-bd20-473c-a9aa-e7839fd66443/tiximogat.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/set_theory_questions_with_answers.pdfIn PDF document text
    • http://gugogedufos.epizy.com/pitulapa.pdfIn PDF document text
    • http://jaledab.epizy.com/beverage_production.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/7095739442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec86b375-38af-4b70-9ce0-6f665fd1e921/bupafimezomawo.pdfIn PDF document text
    • http://bapiwixobenilax.rf.gd/dudixigosunerapeloneguw.pdfIn PDF document text
    • http://nejegidijikoj.epizy.com/1262030060.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/vapumoduredi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e49938b6-7b8c-4253-9c76-8e55955c57a0/nordictrack_act_commercial_10_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/56151530605.pdfIn PDF document text
    • http://batitesejikak.epizy.com/dopabebovepenor.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/49582907543.pdfIn PDF document text
    • http://nepilanobora.epizy.com/jupituforudix.pdfIn PDF document text
    • http://xediguvodolej.epizy.com/n._t._r_mahanayakudu_songs_free.pdfIn PDF document text
    • http://xasakekom.epizy.com/lojisom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c726e9d-c159-4c00-9034-5a7732a5db65/what_is_the_etf_of_nasdaq_100.pdfIn PDF document text
    • http://zinolaj.rf.gd/octahedron_template_printable.pdfIn PDF document text
    • http://tefalim.rf.gd/el_espejo_enterrado_capitulo_13.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_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 5804 bytes
SHA-256: ec003f3ea2e8a6b7acd61b0f7a46c44d7d1c510f8f1e85b4dbd642f0b72346b9
font_01_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 10212 bytes
SHA-256: 88cafb328eebf49f19751be1776042625e47ce9122e5bcf3c08e040099d25475

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