Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1811bc0407f8e59…

MALICIOUS

PDF

78.5 KB Created: 2021-02-13 00:38:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b8e2e9e5e9bb5ccf8ab90ff2ce5c0ae2 SHA-1: fc38a751457206fa65ab85204588aa2b7a0a0a38 SHA-256: c1811bc0407f8e5978f1feaa773e9f1856d305bdd335d6dab247c3590fe89fff
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'crophysi.ru'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, with 19 detected. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URLs and the link farm structure indicate a malicious intent to redirect users to potentially harmful content or phishing sites.

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://crophysi.ru/wix?keyword=most+dangerous+lizards+and+turtles In PDF document text
    • https://static.s123-cdn-static.com/uploads/4481409/normal_5fcdb7b648f78.pdfIn PDF document text
    • https://rezodipegizosif.weebly.com/uploads/1/3/1/6/131606434/490804517a46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_5fd970093222f.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/fetinodikof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_5fd976fed6fa2.pdfIn PDF document text
    • https://vulefewaxamovu.weebly.com/uploads/1/3/3/9/133997320/9914840.pdfIn PDF document text
    • https://wigimosasalak.weebly.com/uploads/1/3/2/8/132814057/6078503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_5fd3931a809b6.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/jepinebawo/finding_averages_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/simple_html_templates_responsive.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/alice_in_wonderland_syndrome_case_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/nabotevor.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/24752111952.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/68703325804.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/organisation_chart_in_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/amsterdam_central_station_platform_map.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/deductive_reasoning_tests.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/27875002944.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/ruxafemofukaxelerubatejep.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_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 4932 bytes
SHA-256: 0963677cb0ac82fca9234022436196b66366234f5cd79770f4bfc781dfff681b
font_01_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 11284 bytes
SHA-256: cfeb53936ca815c0d40090329d7e2fb3dc9e16e627c16f7b7e0446fab9ae98fc
font_02_sfnt_off00011eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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