Malicious PDF — malware analysis report

Static analysis result for SHA-256 232326386f7a4aa2…

MALICIOUS

PDF

78.0 KB Created: 2020-12-27 16:18:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 850e0db626cbac1a13f34061f9541b5c SHA-1: e7aacc82930bfcea2ed754b6a5736dd0149e65f3 SHA-256: 232326386f7a4aa235ce88b9239c6529e17e1e89015b0af3137ec9cbd80922c7
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, with one specifically identified as a malicious redirector pointing to 'ggtraff.ru'. The document body, though heavily obfuscated, suggests a lure related to an 'essay plan template'. The presence of a malicious redirector and the ML classifier's high confidence score indicate a phishing or redirection attack. The ClamAV detection further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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
  • 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://ggtraff.ru/aws?utm_term=essay+plan+template+word
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f87c939510e1.pdf
    • https://cdn-cms.f-static.net/uploads/4496151/normal_5fb8cb7be0512.pdf
    • https://sexitikimuzulab.weebly.com/uploads/1/3/5/2/135296232/nebitewavedumolalo.pdf
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/gokuluvudut.pdf
    • https://cdn-cms.f-static.net/uploads/4449968/normal_5fc05daaee4ca.pdf
    • https://cdn-cms.f-static.net/uploads/4426814/normal_5fdc3c5822c2a.pdf
    • https://cdn-cms.f-static.net/uploads/4412775/normal_5fd1c456854ae.pdf
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/2ca4dcb14d4f0ff.pdf
    • https://figurera.weebly.com/uploads/1/3/4/4/134437403/3dfd34d86.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/39ac99ad-64d2-46c8-8722-b1f655a50401/22re_timing_chain_guide_replacement.pdf
    • https://s3.amazonaws.com/jedaxopopuko/paper_christmas_tree_craft_template.pdf
    • https://uploads.strikinglycdn.com/files/d7ee2e6b-5b95-4339-bb72-3ab9a75dcec4/west_hills_parent_portal.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_off0000f51e.bin
add408fc03bb6ee0233ad9cf810231372bc57bc9c4302b9d7b75285007e04504		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 5256 bytes
font_01_sfnt_off000106ff.bin
05548e0760abe8f1852771bda61991e482672e94985fc94a810bb2331a316995		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 10656 bytes

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