Malicious PDF — malware analysis report

Static analysis result for SHA-256 b631b95bc49272d1…

MALICIOUS

PDF

77.9 KB Created: 2021-03-11 02:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33e0668d9efdcc114cfa2bec617bbfd8 SHA-1: 2a887b0cafb031b18ec22b30705bd131be853df0 SHA-256: b631b95bc49272d154aa537639c9b8992e69132d04e3daeb4a6732e74213cf1f
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and a specific malicious URL. This suggests the document is designed to redirect users to potentially harmful content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature, likely involving phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://midufefew.ru/wix?keyword=fahrenheit+451+part+3+study+guide
    • https://cdn-cms.f-static.net/uploads/4454822/normal_601536b4cd930.pdf
    • https://static.s123-cdn-static.com/uploads/4449000/normal_5fe3c0e58f8bd.pdf
    • https://cdn.sqhk.co/jinubodilev/fu5idwq/xubutazi.pdf
    • https://cdn.sqhk.co/vikoparif/djbLheG/39982052067.pdf
    • https://static.s123-cdn-static.com/uploads/4369146/normal_5ff695dadcb19.pdf
    • https://static.s123-cdn-static.com/uploads/4424672/normal_5fd03c375f35e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://801a9f91-e12c-4b3a-b535-42c3eaff61c8.filesusr.com/ugd/d237ef_d50977f843594f06bd9396748a5ee80b.pdf?index=true
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_1792f2c6940348048879025ad55d33f7.pdf?index=true
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_156f000602814e34a5479be6101d1d85.pdf?index=true
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_c2443b150d554286aa252dbfcb494fe5.pdf?index=true
    • https://s3.amazonaws.com/kelageketisefuv/dobiborijatusadivabegor.pdf
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_49aa52ccff5f43c3baeb2bd0aa79099c.pdf?index=true
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_6325c06c444647ee84405ba07bf1866a.pdf?index=true
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_1ebc04d704164158aea58e9eed515093.pdf?index=true
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_b46dc61f22b54df68b0517582c6c4789.pdf?index=true
    • https://s3.amazonaws.com/sinadi/57426504717.pdf
    • https://s3.amazonaws.com/pisedij/50266796192.pdf
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_df787ec28ee54736a2bdefd7fda969de.pdf?index=true
    • 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_off0000f4cb.bin
2dc493c5a1b0c84069a4c908e84b9de3479b5f831f24837dcc09aac661e36d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 5676 bytes
font_01_sfnt_off0001082c.bin
48b0304321a39d970fd3880332f53bc99f53a340d3d515bcd449f5e088a2dfc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 10056 bytes

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