Malicious PDF — malware analysis report

Static analysis result for SHA-256 d304c04e77ae5787…

MALICIOUS

PDF

77.6 KB Created: 2020-11-11 11:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e21c6a0ae48361e5d8513ca858312e54 SHA-1: 168b60407a7f4beb6d54f803ae1fb13237011bd4 SHA-256: d304c04e77ae57876d6627f26ba27b77eb8e74d4b765133e752ffa460b41c751
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=math+7+chapter+9+test+answers'. Another critical heuristic indicates a PDF link farm, with 26 external PDF links, suggesting a broad attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • 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://cctraff.ru/strik?keyword=math+7+chapter+9+test+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407804/normal_5f982d61800c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_5faa731ba1dc7.pdfIn PDF document text
    • https://pesodubebugi.weebly.com/uploads/1/3/4/2/134234841/zasiduxizijujewobef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448719/normal_5f9f71be0003f.pdfIn PDF document text
    • https://lurefeti.weebly.com/uploads/1/3/4/6/134683691/38fdbbc2cb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f99aaccb551b.pdfIn PDF document text
    • https://menerixejujup.weebly.com/uploads/1/3/4/6/134605313/nixovewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_5fa630242d8d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426957/normal_5f9ec549bf9e6.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/e2ed5babcc.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/nokiwovowus/4_skin_and_body_membranes_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/50752541953.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/61905915770.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 5320 bytes
SHA-256: 5248d9b8a61c1e05a2c40b3d803ff77b1151ad344c761423532db3159546b3fa
font_01_sfnt_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 12548 bytes
SHA-256: 3dc7956d4e510735787c8c626ebf7de69957738967e258127d19b562c1daf9ba
font_02_sfnt_off000112d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 16144 bytes
SHA-256: 703736013dd24d7330a958f3175b40456a848e57017c4f7836dc9244fefb70c6

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