Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fa4643b6b24b3e…

MALICIOUS

PDF

71.2 KB Created: 2021-02-22 23:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d6f57793cb11187cc29ea15f2bb93c52 SHA-1: 207193063c4f26243dde881107860bfbf3de8041 SHA-256: e9fa4643b6b24b3e92e47b7a1920c264da272a5c847b4a376e675515456e6ba8
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs and the PDF structure itself are indicative of a phishing or SEO manipulation scheme, likely intended to direct users to harmful content or exploit them through further redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/wb?keyword=how%20long%20to%20pass%20cfa%20exam In PDF document text
    • https://fumasidabufip.weebly.com/uploads/1/3/0/7/130775820/dujanezuw.pdfIn PDF document text
    • https://kolofajek.weebly.com/uploads/1/3/0/9/130969684/derasalibed-rekabelanozal.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/Ghhgki1/pogixemajesixelurutak.pdfIn PDF document text
    • https://cdn.sqhk.co/gipirukanut/hGebaje/pitukujorezijekol.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/aoCOjeg/83612672785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_5fd5f86bd89c5.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxogatuv/gb517SK/12619961991.pdfIn PDF document text
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/e631843.pdfIn PDF document text
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/vujokogituzowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458389/normal_602a28350ce1c.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/EQifbib/gebaditelu.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/EBhfMgf/vr_crazy_swing_apk.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/nitatotol/graphic_design_courses_in_mumbai_at_dadar_west.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_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 5360 bytes
SHA-256: 6605b9c4af803043f1ea3d3e84f85bfeb782fe84a7576432332687cdf3df6b2b
font_01_sfnt_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 10808 bytes
SHA-256: 05771b3c6b8e0b7a68246228e8254e2c2ceb951600c4c219775dfa63a30011c6

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