Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d86d8936e76ddf…

MALICIOUS

PDF

63.6 KB Created: 2021-02-12 10:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 77b44d3d4c58a784535703447a3ab44b SHA-1: 8e7ed57c50b48f9280dd90da8b40cebb194fea0c SHA-256: 73d86d8936e76ddf649da019799ab09b454801d3edf6fe591e727fa008153b1a
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious redirectors or part of a link farm. The document's structure and embedded URLs suggest a phishing or malware distribution attempt, masquerading as an ebook. While no scripts were explicitly extracted, the PDF format can embed JavaScript for malicious actions, and the heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://crophysi.ru/123?utm_term=pance+prep+pearls+ebook In PDF document text
    • https://cdn.sqhk.co/jaxogubajo/GiajdAN/tixikosumujamanub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413119/normal_5ff505691c225.pdfIn PDF document text
    • https://mekumago.weebly.com/uploads/1/3/5/9/135981587/fipefumemukufudevew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475588/normal_6025f93b90def.pdfIn PDF document text
    • https://rabofabi.weebly.com/uploads/1/3/0/8/130813834/takiluzimokuxawir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_6013380ae172a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476436/normal_5fd2d8a2a3324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_601fcd716457f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_600b8c75d6f6b.pdfIn PDF document text
    • https://cdn.sqhk.co/zibojaje/375zt74/78552011595.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/dubapoji.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/fidobakipivogit/nedebomibofe.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/dominion_post_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/conjuntivite_bacteriana_gestante.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/alfabeto_japones_katakana.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/dubarunikedelabumabiwupe.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_off0000bbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC6 5132 bytes
SHA-256: ac817d969bb0b9d7caee4401f9c795dbf9ef92483f50822b8ecf591e0a8360fe
font_01_sfnt_off0000cd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 10520 bytes
SHA-256: 967519e3ad7742c98339b207b215bd8719481f8cf4c57a5c76dffe240dc44e0b

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