Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b708e8c32033b9…

MALICIOUS

PDF

68.7 KB Created: 2020-11-22 07:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 19e83db96e2c30e1b103b726b6dfd692 SHA-1: c5969ad07358eb011f7f35ae3ae5e4e3fdb11553 SHA-256: b2b708e8c32033b90dac9ff32d701cf863d08c489c449153dcfce84219154622
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM. These indicate the document is designed to redirect users to potentially malicious websites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links suggests a phishing or malware distribution 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://cctraff.ru/123?utm_term=razor+e150+specs In PDF document text
    • https://palukenibimel.weebly.com/uploads/1/3/4/4/134401756/xopunoragelebetasep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421051/normal_5f9891a1e73f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467593/normal_5fb2b01038ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_5fb9b8ed21e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_5fa0c34251799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f87f06b90cf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393514/normal_5f9154c743baf.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/lezopobigeza/33590062092.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/fox_sports_tv_guide_brisbane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d357041-272e-48bb-b37b-fa54a57f7712/ragapasebetuzixopafera.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_off0000cca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA1 5268 bytes
SHA-256: e991c4bf426305a3e6c6faf6d8c67147ef3987044bf74ec79bf825324c0e5e8d
font_01_sfnt_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 11244 bytes
SHA-256: f5e5fe7913d1b85012d9b497f71d9c6866bc2384a8d4fdaf62d51d641d73321f

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