Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caa8e37ba0f58ed…

MALICIOUS

PDF

72.8 KB Created: 2020-12-28 14:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d4365e7aeae46fe1467ae0e3087a5e29 SHA-1: 09b6aca2a6d002068311974b3323695204f7b15e SHA-256: 1caa8e37ba0f58edb5e8d9fae30b247fc41cfc387d10a881093c3fa778407678
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'ggtraff.ru'. This URL is likely used to lure the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/strik?utm_term=last+day+of+spring+semester+2020+byui In PDF document text
    • https://cdn-cms.f-static.net/uploads/4497697/normal_5fe70c5cbcb80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418171/normal_5fd3bec82f24a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_5fdbd03a6315b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454432/normal_5fbe52f25a211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_5fbcbd7b7ff63.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/df60263613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501645/normal_5fad26bcf3b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394066/normal_5fd6a6a6aab72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b91f8d43-629a-46ff-858d-f56d72aad72e/35577859990.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/descargar_anonytun_pro_apk_v6._8_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/zakibexamivususevu.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/kumovuxokaromuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/edpb_guidelines_3_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/96174939109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16617dc0-d21c-480f-998f-8a8752b1e30d/remstar_plus_cpap_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/formule_excel_geboortedatum_leeftijd.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_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 5788 bytes
SHA-256: 608f937f829c40af7c4492a95b1d99cfca76ab23dfed8150fb1442f9b5982ba2
font_01_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 10592 bytes
SHA-256: edefc2d21fd7ed9b0da231ccf713a2bc8a718bdb52e8069c61240465abe1c439

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