Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c640cea79d7163b…

MALICIOUS

PDF

65.0 KB Created: 2021-01-14 02:46:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 368516e20e5dcb50e3a28d75df77c13f SHA-1: b9e3a414ce3bc51fdff8f24c9ac0c599db17803e SHA-256: 9c640cea79d7163b7f50f333287704a8b04f8e2c39952dcca3ecb0c44a0c0d5c
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the primary attack vector appears to be directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/wb?keyword=real%20football%202012%20play%20store In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403676/normal_5fa735114b48b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5fb5a59fe7320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492546/normal_5fc0bec526fb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_5fcb3d4e9c95a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391621/normal_5ffd055f5603a.pdfIn PDF document text
    • https://minufufigazibur.weebly.com/uploads/1/3/4/5/134528603/6319737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f9206ba5d499.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466172/normal_5fe11d15c8f4f.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/wulagisi/xigabude.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/28065218800.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/lumukiforagunopavafizav.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/41719336033.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/vifozaxuvisadixanu.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/82001524891.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/blotting_sheets_cvs.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/devawodomosu.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_off0000c28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28C 5468 bytes
SHA-256: ca3c3e4e62677c0b7758a3ad84c0a9fe3b05fc72281167d0a6b1bbf58d2fe796
font_01_sfnt_off0000d540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 9948 bytes
SHA-256: 0f8d85435998356d7522d470804e5081501a40a44a0533ed345637c313fdae9d

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