Malicious PDF — malware analysis report

Static analysis result for SHA-256 4369599c2b451321…

MALICIOUS

PDF

67.3 KB Created: 2020-11-24 00:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4a26b7b7b55febb6fea2decde6e087b8 SHA-1: e586efd63809eb6ccba6fbab219044876b638db2 SHA-256: 4369599c2b45132155edfe3f3668f79bff5792beb39b80cecde3e2cc30c67eab
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 'traffking.ru'. Additionally, it exhibits a PDF link farm behavior, embedding numerous external links, one of which is 's3.amazonaws.com/tetenifeme/certificate_of_compliance_electrical.pdf'. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The embedded content appears to be obfuscated, but the primary attack vector is the redirection to malicious sites.

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
  • 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://traffking.ru/123?utm_term=osrs+mutated+bloodveld+safe+spot In PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/xiwigaluxoga_zovozarujixafo_lirinapujeturun_piwujixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489983/normal_5fa8c8e6d6399.pdfIn PDF document text
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/nonekezefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_5f987a3526d07.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/tetenifeme/certificate_of_compliance_electrical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/227f320d-2c2e-4830-ae39-7a7a3c416f55/bridge_to_terabithia_2_return_of_leslie.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/legally_blonde_cast_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d623b4c-1847-4ed6-a555-f6849b3927bc/gogiwesiruga.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/letter_asking_for_information_university.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b931f8f6-ae53-443f-8dd3-2baa74024dc7/pewobuligojebowuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a2119b7-e704-494c-8dd3-a6ad9ef6d95c/how_to_download_final_cut_pro_on_pir.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_off0000c998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 5416 bytes
SHA-256: f33290ff1f0866954a20583a6af544ac4541b68b62b1a76a0f614b6961a0cf20
font_01_sfnt_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 10796 bytes
SHA-256: 44f995027aa77027840aa9695f8c2bfab0f62388f883cb8842ec6670d5eaa609

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