Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0aa4f1640ca4fd5…

MALICIOUS

PDF

68.2 KB Created: 2021-03-01 21:57:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ee561e857bd7601a5f7a7df168b8349f SHA-1: 823799a4778b9f96815ba309b429808b9f438d94 SHA-256: a0aa4f1640ca4fd5db13b5cdb0ad1b369cd02f66e0178c41251ee34b66bcd047
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'botokaw.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://botokaw.ru/aws?utm_term=toro+20332+home+depot PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464301/normal_60243a1a7c482.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/fosakuwikivoxinoruk.pdfIn PDF document text
    • http://pubggaming.online/bugs_bunny_all_episodes_list1aoxx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445880/normal_5fe5b87600db2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5ff16ebf2993c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_5fd3a26910876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_601712c390a22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501810/normal_5fd0f9d46e12e.pdfIn PDF document text
    • http://mailedflkf.site/22843429577h5eot.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/at8sghM/pesajenapekosoxixejumuku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485443/normal_60067f05b683a.pdfIn PDF document text
    • http://lastmarkt.ru/jblm-mcchord_visitor_centertr6xf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwemevi.rf.gd/xuxomovadivujuwiron.pdfIn PDF document text
    • http://zadalonidiv.epizy.com/40651687296.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_off0000ce15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE15 5168 bytes
SHA-256: 53df42222ee0420db2ff189474bcf85dfdcfa4a81aec2e8512d30deceb5811cd
font_01_sfnt_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 10280 bytes
SHA-256: 0a4e1b917844697ce78cdcbcf9cd2f77ead53f64338fd3c30041077a5c93d2c2

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