Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77fcdd33e643f43…

MALICIOUS

PDF

70.7 KB Created: 2020-11-10 19:11:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79c6db17cbcce84eec76719ec9e8fbf4 SHA-1: 5a4929c1cc6ac40337bf273099999d0194cfa938 SHA-256: c77fcdd33e643f43b370d9a5d364931e13be5813adc9c000080d9f78b82661b4
154 Risk Score

Malware Insights

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

The PDF contains an embedded URL that points to a known malicious redirector. This indicates an attempt to lure the user to a malicious site, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?keyword=ar+quiz+test+answers
    • https://cdn-cms.f-static.net/uploads/4446921/normal_5f9ed44b3068e.pdf
    • https://cdn-cms.f-static.net/uploads/4377380/normal_5f8bcb868317b.pdf
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5f9cd02eb6793.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xebareto/708-481-8690-8463_is_true.pdf
    • https://s3.amazonaws.com/befarekogol/lab_puppies_for_sale_in_north_mississippi.pdf
    • https://s3.amazonaws.com/simujix/angularjs_4_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/41b7c93a-21cd-4190-9d1a-792f7f5ef6c8/10566467777.pdf
    • https://s3.amazonaws.com/sevoga/45573418395.pdf
    • https://s3.amazonaws.com/jiwisi/fekuzuganalivunewe.pdf
    • https://uploads.strikinglycdn.com/files/001c7d15-20db-4ce5-87ae-1252080c56c8/76380652146.pdf
    • https://s3.amazonaws.com/paropabaru/yaesu_md100_manual.pdf
    • https://s3.amazonaws.com/henghuili-files2/zewuvimimef.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_off0000d827.bin
394047c405c8917031cc612714017e518b0676765dc267c48858b744eeccfbd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD827 4904 bytes
font_01_sfnt_off0000e8ff.bin
56375cc9fa2cf8137422e1d0816cb0cf1f45b72084bd63756b6fb484a6a846f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 11028 bytes

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