Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d1c13f93043dcf…

MALICIOUS

PDF

80.2 KB Created: 2021-03-14 18:50:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c05f272c3814d77f0339aef1068f9c3 SHA-1: 980b3156f5aef0ebe9e63f3bc3cb2ff3ee6e3b45 SHA-256: 88d1c13f93043dcf7076272fae389848466f59dbdb9b337adf2ec3d8a22ca086
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and it contains a large number of external links, indicating a link farm or phishing lure. The PDF is generated by wkhtmltopdf, a tool often used to create documents from web content, and the embedded URLs suggest an attempt to redirect users to potentially malicious sites. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=finished+goods+inventory+on+balance+sheet
    • https://static.s123-cdn-static.com/uploads/4407810/normal_5ffba5963f891.pdf
    • https://cdn-cms.f-static.net/uploads/4368979/normal_60177a03a055c.pdf
    • https://cdn-cms.f-static.net/uploads/4419441/normal_603b42db92a4d.pdf
    • https://cdn-cms.f-static.net/uploads/4383304/normal_604222c441c71.pdf
    • https://static.s123-cdn-static.com/uploads/4393349/normal_5ffe834819243.pdf
    • https://static.s123-cdn-static.com/uploads/4485301/normal_6005425200cb6.pdf
    • https://cdn-cms.f-static.net/uploads/4485572/normal_604cbe8166c7e.pdf
    • https://cdn-cms.f-static.net/uploads/4413007/normal_602b245b414ca.pdf
    • https://cdn-cms.f-static.net/uploads/4420018/normal_602c483b0661c.pdf
    • https://static.s123-cdn-static.com/uploads/4462352/normal_5fc95dcd26ccd.pdf
    • https://cdn-cms.f-static.net/uploads/4373779/normal_5fdc49ddb216c.pdf
    • https://static.s123-cdn-static.com/uploads/4470687/normal_5fcb65913dca9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://todifisafi.atwebpages.com/vexovezubobaze.pdf
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_5ce221698fcc43849e3ca6576f72f7a1.pdf?index=true
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_b7eb8fc4a0eb4ee09d240d2d6a947579.pdf?index=true
    • http://luzojora.atwebpages.com/kerala_lottery_result_onam_bumper_2020.pdf
    • https://s3.amazonaws.com/rurosaveruk/zuwawepitixerudoxa.pdf
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_df1ec565ee074bc2859061415f19de5b.pdf?index=true
    • https://s3.amazonaws.com/xufujofaleki/rasarenefojanigege.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_off0000fa26.bin
226cb744eab162c5279dd9845f44262c9c99ed83afbe72cf7b9aac06976b83b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 5456 bytes
font_01_sfnt_off00010cbc.bin
75f7a1514e29a6827f5dfa84d7aefe03cd6962b9878ae5992162f4cfe5d3854b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 11368 bytes

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