Malicious PDF — malware analysis report

Static analysis result for SHA-256 8823c4a3d1f3266e…

MALICIOUS

PDF

69.3 KB Created: 2020-12-27 00:26:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b5346d958ea0624322ad665ab04ec03c SHA-1: 2ab7e7a723d61bf6d93aa9dc524f6c3634e769b0 SHA-256: 8823c4a3d1f3266ed30493c5d6f937149da8bb705939c876bc6e40926a68a96b
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a high number of embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'traffine.ru'. The presence of numerous external PDF links suggests a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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=zombie+apocalypse+2011+trailer In PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_5fb40b7ee1ade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367311/normal_5fcd50c188c8e.pdfIn PDF document text
    • https://tazesarazuf.weebly.com/uploads/1/3/4/7/134726557/kewomudifafi-bopabal-buwujapiju-lenetewasobe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453732/normal_5fcc2a0de4ba8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484994/normal_5fcfa195498de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_5fb3f57df1c48.pdfIn PDF document text
    • https://sewiwojura.weebly.com/uploads/1/3/4/3/134371681/06980a.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/8ec7a83d-7ef3-48a6-9e9d-084eeec599c4/gudiwimojogovijim.pdfIn PDF document text
    • https://s3.amazonaws.com/luresimosip/birth_certificate_missing_registered_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e6d3e1-3176-4ca8-a700-3add46002b1f/leviz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86271f3d-a6eb-40f4-8d55-9c707dc4e034/add_horizontal_error_bars_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/free_calligraphy_learning_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249bc4ef-fcdd-49c1-ab6b-2ad2acf67b82/defalevumajubajafe.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_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 5604 bytes
SHA-256: 744951fd15c605da45aafd81cb35ad08ebd7e4cc685bb3b8a16044b603749f7e
font_01_sfnt_off0000e629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 10136 bytes
SHA-256: 2a813d8cb5bbe5f229fc857998d23b03458325f924586ea0a31b5bdfaceaab56

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