Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3af69d73f416b30…

MALICIOUS

PDF

68.9 KB Created: 2021-02-20 17:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0e6b21190f402e5d383269438c65fdc6 SHA-1: c5897d60b40d4fa2ac7234168162f0d9bd669285 SHA-256: e3af69d73f416b30c89557737f3d1224087cc9f5cbea4bba81616b47790a7f66
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including a link farm heuristic firing, suggesting it's designed to redirect users to potentially harmful sites. The embedded URLs and the PDF's structure point towards a phishing or malware distribution campaign, likely using a lure related to 'Family Feud PS4 instructions'. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • 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://seumenha.ru/wb?keyword=family%20feud%20ps4%20instructions PDF link annotation
    • http://nutristrike-shop.ru/74696956073q840n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488090/normal_5fcceaa67a9f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_602677b28a12a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444378/normal_60085d2859e30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_602eaf3240125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_60156cdb2c6e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_5fd8d20ad0b01.pdfIn PDF document text
    • http://iclod.tech/musemebupmz29.pdfIn PDF document text
    • https://romiwewigases.weebly.com/uploads/1/3/2/6/132682929/nokezixejiko.pdfIn PDF document text
    • http://bubble1.space/kijokizikarogopanigp6me6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469852/normal_5fdf4bc022221.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/viwoxuz/74917123657.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/fuzuturoridofinamid.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/bba_full_form_in_arts.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/tanemutuwomefuravakapofi.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/77655812257.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17D 5328 bytes
SHA-256: 3a76194cbf0a835555bd2575e2f786883c63bcf4a7f9a34eae2dc04f5e1ae764
font_01_sfnt_off0000d38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38F 10972 bytes
SHA-256: d6666d3f23bf5f0f3ca014385c09049267793850e2ae40b11b74d0df907452cf
font_02_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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