Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f32b560bd345d2…

MALICIOUS

PDF

73.8 KB Created: 2021-05-21 09:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ae00259c343b3c1547326fa8bff840e SHA-1: 646e81487248a3f68ff519a9e555f96e73bba8a9 SHA-256: 05f32b560bd345d29010d54ae27a7bce5114734a69c32bf0c3cebc25c43d4630
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain (jumiwimov.ru) that is flagged as potentially malicious. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting an attempt to create a link farm or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=ejercicios+verbos+haber+ser+y+estar
    • https://static.s123-cdn-static.com/uploads/4379855/normal_5ff59e434122c.pdf
    • https://cdn-cms.f-static.net/uploads/4469623/normal_604a4cc7b2257.pdf
    • https://linerebe.weebly.com/uploads/1/3/0/8/130813546/21d40b10d7.pdf
    • https://static.s123-cdn-static.com/uploads/4369663/normal_5fee904661a73.pdf
    • https://tenemetit.weebly.com/uploads/1/3/2/6/132696414/0f55e3.pdf
    • https://noxerurivago.weebly.com/uploads/1/3/4/7/134767941/vowulobizarefe.pdf
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/8463715.pdf
    • https://jovanifapekiba.weebly.com/uploads/1/3/0/7/130739678/firisa.pdf
    • https://fafafupoxojamu.weebly.com/uploads/1/3/5/3/135350358/dudot.pdf
    • https://sewajevujunu.weebly.com/uploads/1/3/2/8/132814136/9447668.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f943d517-a96f-44ea-bdcb-ee954797d99d/what_influences_both_chemical_weathering_and_mechanical_weathering.pdf
    • https://s3.amazonaws.com/suxiweke/special_days_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/ed1a50f7-d9c8-470b-b483-490d7a336dab/dazobelemufejiniwel.pdf
    • https://uploads.strikinglycdn.com/files/f3ca1856-997c-4423-a7eb-3d7a48d33b9c/what_was_the_worst_year_in_the_great_depression.pdf
    • https://uploads.strikinglycdn.com/files/485f8d8d-a819-48b0-9f9c-7e3f84450e8b/nuramawalobipa.pdf
    • https://s3.amazonaws.com/sirilagewuga/fender_mustang_3_v2_shipping_weight.pdf
    • https://uploads.strikinglycdn.com/files/43611ff5-5ef0-4256-b453-6d84b704889e/numinamuzimerigamulisim.pdf
    • https://s3.amazonaws.com/gotitibekovi/6755018864.pdf
    • https://uploads.strikinglycdn.com/files/f607607a-e665-4954-b125-42766e1a817e/25008493915.pdf
    • https://uploads.strikinglycdn.com/files/76c0c98e-a0ce-47d3-942a-4c2df0b3253f/did_britain_invent_the_modern_world.pdf
    • https://uploads.strikinglycdn.com/files/558d3852-34ad-47d0-b349-43e62450a763/does_boston_market_chicken_have_carbs.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e386.bin
377ab866fab4fd5a7952fd49c2dce047d31ab3a7fcd077484accc7a2b96d3f20
pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 5188 bytes
font_01_sfnt_off0000f53b.bin
d9a8c88537196a5b5a6a516eb76478db3b7f7750dc14299c73d29c46e7ed2846
pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 10828 bytes