Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4a9b537720cabf…

MALICIOUS

PDF

96.9 KB Created: 2021-04-06 22:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f629e849f2229a072500659c188a5c4e SHA-1: af24feda601476810fe2e91ca793c110a1fe2db8 SHA-256: 7f4a9b537720cabf634f4f54153277dbba8bfe8a1ea061fab5b792c583451ae0
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to other PDFs. The primary malicious URL identified is 'https://gimoguvi.ru/strik?utm_term=social+learning+theory+definition', which likely serves as a gateway to further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO-based malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://gimoguvi.ru/strik?utm_term=social+learning+theory+definition PDF link annotation
    • https://guwulazavuwaba.weebly.com/uploads/1/3/2/3/132302871/6630339.pdfIn PDF document text
    • https://bumujonawomete.weebly.com/uploads/1/3/4/4/134435367/bef0bb3372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416932/normal_6029c590e704c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_605964dc46855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470821/normal_6029510c6521a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486552/normal_5fcc1a50e87f0.pdfIn PDF document text
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/1690266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_5fd185a5d9551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_6032e0217a82c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5fe74f7a87c52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414852/normal_5fccaaa88cd30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414871/normal_60063af1a15e2.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/66ced2b8-587f-4175-a90a-522da00ba775/77464259580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5424f2-45d1-4041-9d11-f5c1774830ab/humminbird_helix_5_sonar_g2_portable_fish_finder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea800e30-4eab-4863-8785-7c353353fa03/how_to_put_camry_hybrid_in_maintenance_mode.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_f1233e8fd32e47d08732ab57e830ba5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d26f80ee-f4c5-4224-a122-742468aa914e/rusod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aef17e17-deb1-4384-8409-98482e4c780f/nurewudiwopidokuwudonefa.pdfIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_b853b25088074cb4bc1c58804327a1cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/675071a9-4109-4be8-9c33-ce7495493060/21052533688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6faa189-be6c-4d6c-8f2c-9b2fc83a1890/12300685270.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_56cb314ea9c94b058e0b950bcf4891d4.pdf?index=trueIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_38f99b2db1c24706be6fe19f740f9d1f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82593c3b-0f9f-49d6-89d6-7224a3a5e3d3/craftsman_18_inch_42cc_chainsaw_fuel_line_diagram.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_off00013ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDD 5308 bytes
SHA-256: 89dcd17b3b0eee5cc00066f45e7dd2b0d35fdd1b5ae08a3289715b694a9ad8f7
font_01_sfnt_off00014fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEF 11400 bytes
SHA-256: c241645329b33c687cebc3f9e05e84ac7d8297dadbf83abc3d84696a3e37b310

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