Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bb1628ce1631bc…

MALICIOUS

PDF

76.4 KB Created: 2021-03-28 07:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b9469e3d55ce952ea5758b5ff15e02e SHA-1: 941968915a8cfd5760479aa5943dc977d083d992 SHA-256: a8bb1628ce1631bcf478b306cc55149fd908f890dd76f4a04fab3f98004c25cb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing sites, with one prominent URL leading to 'jumiwimov.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

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/wix?keyword=ti+nspire+cx+ii+manual
    • https://cdn-cms.f-static.net/uploads/4419003/normal_601715ab7831b.pdf
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5fcf3979cad96.pdf
    • https://cdn-cms.f-static.net/uploads/4403674/normal_603b46b0b6f4b.pdf
    • http://rupazaduxil.mywebcommunity.org/vewumagalafamuvejowejuf.pdf
    • https://static.s123-cdn-static.com/uploads/4378160/normal_5fc7aaf2dd768.pdf
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5fe4625104a8f.pdf
    • https://cdn-cms.f-static.net/uploads/4486566/normal_6025cf046080a.pdf
    • http://sijemogezabusa.sportsontheweb.net/cognitive_bias_codex.pdf
    • https://cdn-cms.f-static.net/uploads/4387218/normal_601c008549e68.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_969b54de2dc040e6943786601d18297b.pdf?index=true
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_041064b2436343d8b2a66367c2ab19a8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0d13d0a4-8e1c-4976-97a9-25f6f21197cd/xebogejegetoruzoni.pdf
    • https://uploads.strikinglycdn.com/files/fd002620-bc08-4c3e-936b-7ccf35da717a/67669413924.pdf
    • https://3df016ad-b40f-424f-9918-b96c60f46212.filesusr.com/ugd/387bfe_f3d8fd9681684497afadca000a866949.pdf?index=true
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_b7d97eb62584467ebf199c55d819aa05.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e39c8fe0-1146-4b85-a2f1-18eb8fa67da6/how_to_change_the_oil_on_my_craftsman_lawn_tractor.pdf
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_f85bedc0d6334e5e94d53b8494ba2fd9.pdf?index=true
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_57125459d8854f928383a00a67354d64.pdf?index=true
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_1d23742b66404d7d8973c7fb3b667cd0.pdf?index=true
    • http://xotopusedewix.myartsonline.com/100_most_important_events_in_world_history.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_off0000e117.bin
6161143a3dbf9e79a39be9807d7a5cc5e0f3ff93d5dc28f58fb711d53d5e166d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 5096 bytes
font_01_sfnt_off0000f257.bin
ab3bd34f6cd5753537827706cf70e98cbfd576440eeb3ee605e068e444aa170a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 15468 bytes

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