Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f21b5d7db5acb2…

MALICIOUS

PDF

66.2 KB Created: 2020-12-21 22:51:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 257081a6d4ad0329bb9abb3e0fe0a8b8 SHA-1: 848f29decdf2f743b690a1faf04333f7a8d0cbfc SHA-256: 70f21b5d7db5acb28f95c096d71ae3ab99eed3a931164b9b5ba4caea77a342d4
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, 'traffine.ru', which is a critical finding. The ML classifier also strongly flagged this PDF as malicious. Although the document body is heavily obfuscated, the presence of the malicious URL indicates a phishing or malware distribution attempt. No scripts were extracted from this sample.

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://traffine.ru/strik?utm_term=banana+cake+recipe+gluten+free+dairy+free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4417543/normal_5fdfadafe04f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_5fb2745ae8a30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_5fa837f2d6da8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_5fbb5bef63b36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421788/normal_5fcd071f3b84a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_5f9cba2d87cb8.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/rorives/98261533170.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/4822447279.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/jiziditasewibizizuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19085a72-4014-42f1-adc3-f45b624cd48a/88127451883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b212e81-925d-47b0-84c5-b09e6fe55bf9/4_learning_styles_quiz_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0516ba-a61d-4117-9262-7541e3bb5fce/26412253852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6640522-4494-48c8-9e4d-301d28511b6a/dunudaduriwobudaki.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/php_ajax_mysql_search_form.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/iddaa_canli_skor_nesine_android_gezginler.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_off0000c621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC621 5360 bytes
SHA-256: 8af1bb97f8414cdc323e0157f22e68ea4c67ac1c7e20e06a4ccd8ef2653c48c8
font_01_sfnt_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 10284 bytes
SHA-256: c64b9a0e789d62c417686a0ffd4ba84c2f6b8ad0628432ed0936a722ba6b65de

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