Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee52a2657334a683…

MALICIOUS

PDF

76.0 KB Created: 2021-02-24 14:44:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9d08bc3c347b8d1706b7348d713fe044 SHA-1: 04fde308787371665f9d69f9d0c333e5152d59d5 SHA-256: ee52a2657334a6830df23eb7633df4e85c91b89082cc9f2c5e31479051f4d6e6
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector link to 'crophysi.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of a malicious redirector URL suggests the document is designed to lead users to a compromised site, likely for phishing or to download further malicious content.

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://crophysi.ru/award?keyword=best+strength+exercises+no+equipment In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_602482aeb15c7.pdfIn PDF document text
    • https://rujuramokukavet.weebly.com/uploads/1/3/0/7/130739146/bowuvo_nibeve_fufeka_firakabowudexe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415081/normal_5fcd0d0276ad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_600c1eaf210d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465133/normal_5ff4a27b83e37.pdfIn PDF document text
    • https://kadefevexenikoz.weebly.com/uploads/1/3/0/8/130813118/bidepabu-pifutatokiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383445/normal_6002113f1977c.pdfIn PDF document text
    • https://bobilomagavakux.weebly.com/uploads/1/3/4/8/134868487/271705.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385422/normal_6006b92de88ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_60233182e5295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408720/normal_5ff871a53f579.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/wavazoramavukumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462059/normal_5fe7d9ff0c53d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_600c563e737d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_601b474067d9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5fcf2ddc058f2.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/pisik/math_fraction_worksheets_1st_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/baldomero_lillo_cuentos.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/tanapag.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/89430267894.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_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 5232 bytes
SHA-256: ca634e387553ed3b297dde0f2e5d43ba69b24e7f4bd8d3d094319f6966285679
font_01_sfnt_off0000f113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF113 10328 bytes
SHA-256: 807c6ed18ec9d6473414c05982d05e530ad3cb3396422621d03737b43de0c466
font_02_sfnt_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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