Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c311b1132081848…

MALICIOUS

PDF

74.0 KB Created: 2021-03-21 23:15:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 02164732d97b6de05bae961bccd3628b SHA-1: 76235ea37eb2bd7bf23478383b3f8abbccede59a SHA-256: 5c311b11320818487928a9fb274376d35f8e773fe10c5227d7a05456c084fae8
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs that are flagged as suspicious and part of a link farm. The document body, though truncated, suggests a lure related to changing a thermostat, which is likely a pretext to encourage clicking on the malicious links. The ML classifier strongly indicates maliciousness, and the presence of external URIs points towards an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://baarspo.ru/strik?utm_term=how+to+change+vivint+thermostat+to+heat PDF link annotation
    • http://getveran.site/86654667600ax8g8.pdfIn PDF document text
    • http://urro-hu.com/outward_best_buildq7m61.pdfIn PDF document text
    • http://frasqen.online/wemadus2by7h.pdfIn PDF document text
    • https://cdn.sqhk.co/roratumopiv/dZEhcgi/mikafenikamodogudexani.pdfIn PDF document text
    • http://umdtheatre.ru/zadivixitugijideuvfgr.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/PF5hgjc/42091284789.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/tadejupuworigidevajibevuxlfq0.pdfIn PDF document text
    • http://virnet77.ru/how_to_refill_a_boiler_heating_system2zaeu.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/f7wjjbG/digital_marketing_certificate_online_free.pdfIn PDF document text
    • http://laitlabs.pro/84372934145yz2i6.pdfIn PDF document text
    • http://raisinshub.club/2073622280orv1r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosodesuvivat.epizy.com/43554196818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09aeb331-d24c-4dd6-b8bd-6aaa4844423e/20290060885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a66d3c-7e4c-45fb-a117-7a7e6e21e117/les_trois_mousquetaires_film_1961_streaming.pdfIn PDF document text
    • http://kanulinuwuri.epizy.com/rokiwuwunatilorufulugun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/019381ca-0b72-4ba0-94e7-18fe2ffacea8/51494236568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f96764ae-f905-4b02-b146-63b3cec0b359/new_york_state_map_with_cities_and_towns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd3279f9-e631-426a-a625-4591b6c4bb43/97526569903.pdfIn PDF document text
    • http://porilebunenagu.rf.gd/kaththi_malayalam_dubbed_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529b92ec-feec-4186-9719-3bb2d7c7844f/97661989289.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_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 5292 bytes
SHA-256: 67de5e775dcce721a02cba0239943af0235598d054dd53ef0336eb102642728a
font_01_sfnt_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 10036 bytes
SHA-256: ebb9f7489994dcf90cae4e9b499a8a620944569124b626c8998c15277092424a

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