Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d4709bd774db42…

MALICIOUS

PDF

78.0 KB Created: 2021-03-03 02:24:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9a0b4662b684e15c719661d874273cac SHA-1: b6db184fca757fc8032f81a3830075c37b7bc8b9 SHA-256: 20d4709bd774db42b212467e5b19b291350ce233816876a79aa6329a049c1d72
244 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to attract traffic. One prominent URL, 'https://crophysi.ru/wix?keyword=super+mario+3d+world+download+code', suggests a lure related to game downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=super+mario+3d+world+download+code In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448733/normal_601868ab005c7.pdfIn PDF document text
    • https://kesesitevon.weebly.com/uploads/1/3/5/3/135317357/e851bf4a24f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421472/normal_603223bc85d10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414688/normal_603de30c531d6.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/how_to_become_a_forensic_handwriting_expert.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490930/normal_600975df72a85.pdfIn PDF document text
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/9e3a77846.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489259/normal_5fecd1b913b82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530910/normal_601af097e1e96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_601d135b033df.pdfIn PDF document text
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/jiwarexotevojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496602/normal_6010e3d10c081.pdfIn PDF document text
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/5f2d35a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368982/normal_5ffd5399ad29d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389820/normal_602e259f854b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixuroruwe.myartsonline.com/nafexo.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/67966438887.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_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 5400 bytes
SHA-256: 06e42ab059e209226c440265bf8f2f8cc27df05d112db40329019352a8804396
font_01_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 10208 bytes
SHA-256: 14eae93eb6835b2465a0f33e83fc4afd92fdf24b656de9b296d26909b1b9fcf4

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