Malicious PDF — malware analysis report

Static analysis result for SHA-256 91293853691185af…

MALICIOUS

PDF

70.2 KB Created: 2021-06-09 22:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 531fd547f60795f71ebfb0bc893afd5c SHA-1: 4c0f79a6ebff2637c97e42899939335206a114e0 SHA-256: 91293853691185afbfec422990789d607fe9d7c22c654ad1ca2435866cdb7d39
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to obscure malicious activity. The presence of an external URI pointing to 'medvor.ru' further supports the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/pbw?utm_term=simple+biodata+format+pdf+download PDF link annotation
    • https://dizugupixaxagoj.weebly.com/uploads/1/3/4/4/134440249/5839136.pdfIn PDF document text
    • https://valuluxunu.weebly.com/uploads/1/3/2/7/132710491/8837531.pdfIn PDF document text
    • https://fifubinagate.weebly.com/uploads/1/3/4/8/134854053/jikaru_luwizuzupajok_seposevapikolu.pdfIn PDF document text
    • https://voxapuxunud.weebly.com/uploads/1/3/1/3/131381802/cc368.pdfIn PDF document text
    • https://fabedajigunud.weebly.com/uploads/1/3/4/4/134480588/06faa33d23925.pdfIn PDF document text
    • https://fetavagipiw.weebly.com/uploads/1/3/1/3/131380759/wokadipekupejuguvejo.pdfIn PDF document text
    • https://wimuwiberajiwas.weebly.com/uploads/1/3/5/9/135965043/531530.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/f551f78e-41fb-47eb-9cd7-c19ca59a1707/philips_respironics_system_one_remstar_bipap_pro_bi-flex_and_humidifier.pdfIn PDF document text
    • http://molosafokaji.pbworks.com/f/gugaran.pdfIn PDF document text
    • http://zorisomofi.pbworks.com/w/file/fetch/144545151/what_is_intercession_prayer.pdfIn PDF document text
    • http://lenivuzuk.pbworks.com/f/53294317569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2adef334-54a5-4725-b22e-eee2b61ebca0/39614580293.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144548025/handwriting_paper_printable_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c09568d8-a372-4c37-a05b-b4f1665190d1/56786252788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c12ab0f-468f-4aae-a423-890b4799b54d/21414361806.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/vutawiluxalajo.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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 5344 bytes
SHA-256: f30c0dbff1a35268e52d9976bb7b57f8a6da0dcc037cc0f78cb6eeab0fdd48f2
font_01_sfnt_off0000e856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 10376 bytes
SHA-256: 496f441c8ffb7318eca2f01920f822c1400f0c104c1c7625ca0e847d087a2eae

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