Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eee9a80c22918b7…

MALICIOUS

PDF

71.0 KB Created: 2021-02-09 04:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3d1f2badbfeec8fd2b365ed050eb29b7 SHA-1: 184e81ea943c6b19d2733da06c74debc3b033b93 SHA-256: 7eee9a80c22918b73bbf96f127c00b7144f7d23859b8ccac38954df25f923f6b
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a medical report, aiming to trick users into clicking the embedded malicious links.

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://yafferge.ru/aws?utm_term=bronchopneumonia+x+ray+report In PDF document text
    • https://cdn.sqhk.co/modajili/iicicNL/jodimezivuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_6011900088613.pdfIn PDF document text
    • https://kavirozix.weebly.com/uploads/1/3/3/9/133999962/ab7644755063d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482618/normal_5feb31a7546aa.pdfIn PDF document text
    • https://kofudisefases.weebly.com/uploads/1/3/4/0/134018526/tufopukatexutudu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406497/normal_6007e1139294a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_601555866123e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466175/normal_60021530115f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_601bc16d7c537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fd2600d1867e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407793/normal_5ffdd30d66025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_601dc80fa7516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382420/normal_5ff2c3aa53680.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/mujesogi/human_body_systems_worksheets_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/lobapawumujosa.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/85267217147.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/virus_scan_online_para_android.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_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 5184 bytes
SHA-256: 421229bd2b207aae4abc545e98766241c9da0fa01ee3dacd8a28fe99da352e4c
font_01_sfnt_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 10452 bytes
SHA-256: 6216299937a61fe657e877dec1e0ab675ddfbd7703de6f3ba3d7f19dc25115ce

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