Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31cdaffbce41592…

MALICIOUS

PDF

87.6 KB Created: 2021-01-01 13:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7dfcf91eb8af3e4c3a482bbcaf35d44b SHA-1: 747447ec8c2a535fcad588be744ecdc574450836 SHA-256: e31cdaffbce415926760f2708682f8607311f04dba761199886f79a8676674ae
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?utm_term=wood+cnc+machine+for+sale+nz'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, with 'https://s3.amazonaws.com/libusamagowuvo/positive_attitude_test.pdf' being the first identified. The ML classifier and ClamAV also flagged the file as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/strik?utm_term=wood+cnc+machine+for+sale+nz In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5fa466ac6460d.pdfIn PDF document text
    • https://rafomuvufeja.weebly.com/uploads/1/3/1/8/131856077/wizibab-kebidurejataper-fitiforonedik-naguto.pdfIn PDF document text
    • https://cdn.sqhk.co/daxutoxod/jagchfJ/dog_smiles_live_wallpaper_iphone.pdfIn PDF document text
    • https://buwuxebukiz.weebly.com/uploads/1/3/1/6/131606134/256498.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476566/normal_5fcd313c714c0.pdfIn PDF document text
    • https://cdn.sqhk.co/taxeseta/iigfyhh/download_stickman_wizard_mod_apk_unlimited_money.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426279/normal_5fc3ac4269564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_5f9788c878ae5.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/libusamagowuvo/positive_attitude_test.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/lamokomugawabimidox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797e4afd-9c2e-4a76-9805-f67e74b72b91/coleman_18_x_48_pool_pump_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/98432787960.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/vunaregar.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_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 5324 bytes
SHA-256: 127a65cd0b730a7a15e740b327ceb2260214f32be7b690656baf9ac5e21ae274
font_01_sfnt_off00012be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE2 11084 bytes
SHA-256: 396337b1a6333902a657a20ca28bf92d80758351f04906130b2648b54c7d6459

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