Malicious PDF — malware analysis report

Static analysis result for SHA-256 86064417770b9f24…

MALICIOUS

PDF

77.6 KB Created: 2021-05-22 20:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bd076c0034fc8b5dd4861980946c56b8 SHA-1: 7292451d2f34264b1b2ec0dfb650b4331b62c70b SHA-256: 86064417770b9f241e0036a0ed1e66061fd6b1457ddd3ee594b247e63cf9d74c
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a redirector pointing to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards malicious intent, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=ultratech+im-1270+datasheet PDF link annotation
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/mujazinimisawo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374853/normal_5fcbc05c23024.pdfIn PDF document text
    • https://datedevob.weebly.com/uploads/1/3/1/3/131381982/a534c551cec3.pdfIn PDF document text
    • https://zelasiboromur.weebly.com/uploads/1/3/1/6/131606405/piwet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_5fd33c4859cf7.pdfIn PDF document text
    • https://sufusazowuk.weebly.com/uploads/1/3/4/3/134311692/virupaviv.pdfIn PDF document text
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/6629494.pdfIn PDF document text
    • https://lalinixew.weebly.com/uploads/1/3/4/2/134265361/5bdd51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_60320f25b8a55.pdfIn PDF document text
    • https://wobadudubabu.weebly.com/uploads/1/3/4/5/134510413/5363244.pdfIn PDF document text
    • https://jefiwosu.weebly.com/uploads/1/3/1/3/131379536/3031546.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413236/normal_5fc91bca1d891.pdfIn PDF document text
    • https://vemenujobife.weebly.com/uploads/1/3/5/3/135399872/7569717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422906/normal_60584670f164d.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/sedowedi/72759772818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd0743c-e1d2-408f-b7de-5c661da396a3/tanusewodajogovagesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07c98a7-8e2e-47b4-9094-94d6b36ef806/manunexutuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f79f433b-5f74-46a6-8db2-f69d6cb55983/wings_of_fire_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/mepoxepogarugipezar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff6c3a13-0f57-4927-bf14-4f94752455de/27141476952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1daf1b-0183-443e-8628-59267656cf97/kitchenaid_repair_locations.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_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 5608 bytes
SHA-256: 101ef420941267a6a477ea23fe089cb62c5237d5e3860f723dd3c4fbb75172c7
font_01_sfnt_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 11248 bytes
SHA-256: 6bb63d2434d991c968e248715888bce4c76b816cfdd01ebf116d4a49044a1e73

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