Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eec3968eaecac99…

MALICIOUS

PDF

71.1 KB Created: 2020-11-24 05:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 043c9b523081df2a07925f5fd4a9b605 SHA-1: 3bd252ff622f30a778e9352910727b6c7f3104d2 SHA-256: 3eec3968eaecac99586cd8c6fb5039d11d05a2944b48344a405c249ff2e4d06f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with one critical link pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

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
  • 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.
  • 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://traffmen.ru/aws?utm_term=greek+to+english+bible+translation+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_5fb73101489f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412161/normal_5f94e0e515ff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5fa1418ccf372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392666/normal_5f9b44a474a15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387589/normal_5f95e80c4c8f6.pdfIn PDF document text
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/komolife.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/vovuzize/13118451947.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/puluvirodejabinafemu.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/arabian_nights_free_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/71472882308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb8bd1c-60e8-4d79-b1eb-cf0cbb7c9b50/test_habilitation_electrique_corrig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464fb275-394e-42fa-a8a6-7214231cdfd9/dictionary_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/bigugusidekufamozanesipix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3812c62-1248-48bb-a508-53eafa123a81/diagrama_de_fusibles_lupo_2005.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/72058110611.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/qep_manual_tile_cutter.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_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 5264 bytes
SHA-256: 9bc1bfa40ef57afcc1f71fd695f9548885a2d54d40e2135b0c485702d75cfe8c
font_01_sfnt_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 10460 bytes
SHA-256: 51088daa8049fd07e083d7870ea80cff64eece73100286e30947ae8e687e4f89

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