Malicious PDF — malware analysis report

Static analysis result for SHA-256 61929b98f58d2211…

MALICIOUS

PDF

77.2 KB Created: 2021-02-28 06:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0900294a84e1d9f96e6f17c9f34a9807 SHA-1: 1643358581970337b9754e41c9963f0ad4c7cbbc SHA-256: 61929b98f58d2211160e2e88f28f49e7143e9f6b9727b702245468d2b52e90a3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://jumiwimov.ru/aws'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked PDFs. No scripts were extracted, but the structure suggests a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=will+covalent+bonds+dissolve+in+water
    • https://cdn.sqhk.co/wikelere/d0tV0jh/47281540802.pdf
    • https://cdn.sqhk.co/lawafopugu/7ih3ieZ/fuziz.pdf
    • https://cdn.sqhk.co/dukoredod/ifpl8ih/neuron_model_labeled.pdf
    • https://gijojipile.weebly.com/uploads/1/3/1/3/131381352/jikobupen.pdf
    • https://static.s123-cdn-static.com/uploads/4368982/normal_5feb6b125588f.pdf
    • https://vorapitejure.weebly.com/uploads/1/3/4/6/134605364/2303350.pdf
    • https://cdn.sqhk.co/xubipoxeguza/Lq0ijSB/67886846161.pdf
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/tijafevade.pdf
    • https://cdn-cms.f-static.net/uploads/4495551/normal_60142cd077365.pdf
    • https://cdn-cms.f-static.net/uploads/4451225/normal_601dce23d98a0.pdf
    • https://nudadisaxoge.weebly.com/uploads/1/3/4/0/134018155/gudumivigegovu.pdf
    • https://cdn.sqhk.co/gixedomawa/fhiihgi/solitaire_ring_wedding_band_sets.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://virirunabeso.rf.gd/bovozaxowonakipifaz.pdf
    • https://s3.amazonaws.com/besafefaf/android_show_startup_apps.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_off0000f0c0.bin
ee4c9e04be07ac31765eb9f2d6d019f0e3eaadff9a01ba644d3236093bdc1eab
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 5236 bytes
font_01_sfnt_off000102b3.bin
e8c89fb65125cd79958af41635a2c8e33e95c393e852bd81fc7465995e7caacc
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 10872 bytes