Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd039269c986bf88…

MALICIOUS

PDF

85.9 KB Created: 2021-02-16 01:06:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 463b4af6c972a88eca2ca7c525f3638b SHA-1: 20340aaff8fcff4269b40f80273bbf91e7891384 SHA-256: bd039269c986bf88d7c68932fe1cacb69443b811239b30cca1928f9d8db5175d
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and it contains a large number of external links, indicating a link farm or phishing attempt. The PDF_SEO_LINK_FARM heuristic specifically points to a mass of external PDF links, suggesting the document's primary purpose is to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and numerous URLs strongly suggest a malicious intent to redirect users.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/wix?keyword=baby+animal+and+mother+worksheet PDF link annotation
    • http://vadusulu.iblogger.org/articles_of_faith_lds.pdfIn PDF document text
    • https://cdn.sqhk.co/lonubugogere/DDjgcic/11130448963.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/MhcJBHb/new_horizons_mobile_home_park_sebastian_fl.pdfIn PDF document text
    • https://leresidatebij.weebly.com/uploads/1/3/0/7/130776374/dobif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477921/normal_6007bd4959ba1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389820/normal_5ff179767bd05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420432/normal_5fce446bdc5f0.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/jopevure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484605/normal_600577e0538c4.pdfIn PDF document text
    • http://kebosukav.22web.org/fageritikekinugigivurujut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_60145b75e6470.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/0iiRii8/63256537954.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5ff85a8f2863d.pdfIn PDF document text
    • https://zugasunisozabij.weebly.com/uploads/1/3/4/7/134759734/genepar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387035/normal_6001c05ad7f66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497348/normal_5fd7c14a96f63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://turomidujamo.epizy.com/berlin_wall_timeline_worksheet.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_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 5512 bytes
SHA-256: c7cd867a307846878aef0eee2b179315209cee542a310d9852fc9689e24ab3f8
font_01_sfnt_off00012531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12531 11004 bytes
SHA-256: b87b481d73f09286de7e5ad212e41ab280434f32caf731d5ff1fb9a8e61ae3b4

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