Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea70300eb4b5a60…

MALICIOUS

PDF

79.1 KB Created: 2020-12-15 20:21:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: da9f004638734938ecaffaaf1df2893c SHA-1: efce8a585005369cc70dacbcf8a42b1e1782773b SHA-256: 0ea70300eb4b5a609fecf105de2cfaaabb35ce38105ead064e86ecf9d27c5434
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDFs, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or hosting further malware. The embedded URL points to a suspicious domain, trafffi.ru, which is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/strik?utm_term=letters+on+the+aesthetic+education+of+man+summary PDF link annotation
    • https://kofusozefo.weebly.com/uploads/1/3/4/5/134515267/ruxadezavupijas-mikizubogewodu-wigofenapuwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/89dfabe4-2a65-45d9-ab0e-90f6ae6048fc/37279293983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4650ef26-0fdb-4d6f-ae2f-b20f66047186/xunikojapokebuvixoge.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ecedbf71053ccb1052a5/t/5fc5854de6d49a06bb501292/1606780238050/the_science_of_getting_rich_in_tamil_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0751c243-7406-4ab3-93f0-b66702eaf1d1/basic_tactics_for_listening_3rd_edition.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29253a3bf4b14abb3bccc/t/5fd1a47b7cf94534dc581f2b/1607574652804/sword_of_xolan_act_2_level_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e8b08a-354b-47de-b974-219634d9ee3a/clean_master_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b45876-f0ea-4bb0-b140-29179e729193/joduxegazekosarunusupufik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd46836-811e-4a44-b55b-16ac8be7733c/votelu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64fea085bf90c0e22058c/t/5fc71cf90791337046ddd534/1606884602998/sexobejej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd8f731-3105-4285-9882-eb1d43bad07b/zell_miller_scholarship_emory.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/activity_3.2.1_protein_synthesis_answers.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_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 5272 bytes
SHA-256: fc2907e8d105f0e9d7a33624d31b47f6e5096ee05ab238bfa0d4ca4639682aa8
font_01_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 11312 bytes
SHA-256: f27fdab8de2e34cf35e3b835d9b80ee3bdbd87926ef45ab073405201ab4433fc

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