Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39e76075eee897a…

MALICIOUS

PDF

70.6 KB Created: 2021-02-08 13:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3548fc419bcd4d6e013bd1faf599851e SHA-1: a115772e888642410f6d414b8ffe14e5a5ce56b5 SHA-256: e39e76075eee897a01aa86ec052f27761725c101fffd31c58d14de3e52650230
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'bologen.ru', suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wb?keyword=chm-%20u01%20flash%20file PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485570/normal_5fcf15ed0bc6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408330/normal_5fe2c54881a93.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/9536805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fd328f7f1ed2.pdfIn PDF document text
    • http://copyrightsupporteds.com/78400456981dyg0t.pdfIn PDF document text
    • http://ketotreno.buzz/26133567813j3ujq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_5fe653cf2116e.pdfIn PDF document text
    • http://udilische.club/goliwatoxizode0j5p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_5fd7a5c823f36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408190/normal_5ff603e299b36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403130/normal_6004f738576df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462059/normal_601b1a89bfac7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410448/normal_5fed49a7c9d42.pdfIn PDF document text
    • http://teren.fun/sim_brothel_guide5bwz9.pdfIn PDF document text
    • http://amsidisi.xyz/zefosabixougcb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474170/normal_5ff39d4fdd357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/22677957032.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/jatifeduxugugawapu.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/mavuper.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_off0000d832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 5044 bytes
SHA-256: 36e19af8496941617b5e158d7567d43ad3a2629a59fc27410503c2811e7a5098
font_01_sfnt_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 10664 bytes
SHA-256: f78cbcb617cc1a433541821dbf02b486480aedc46395a134e1857eaca8f2a682

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