Malicious PDF — malware analysis report

Static analysis result for SHA-256 518f7fdd55a3f959…

MALICIOUS

PDF

96.4 KB Created: 2020-12-20 16:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 72c4e1ab8e83f8c246c960a3fd47ee51 SHA-1: eafaf7d216bee174d0e533d3b620f23c8a510747 SHA-256: 518f7fdd55a3f959d0981c913df0cc37ba3d7ba1d9732f3365a5c066ca22abcb
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector and a link farm. The ML classifier and ClamAV also flagged the file as malicious. The primary malicious URL identified is likely used to redirect users to further malicious 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://traffmen.ru/strik?utm_term=sol+de+medianoche+libro+colombia In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5fd5f1fad6574.pdfIn PDF document text
    • https://jinokafolamod.weebly.com/uploads/1/3/4/3/134310646/20f9f3345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_5fa05ba9833a0.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/7ad7ac61-9651-4762-8220-8cb727d38a90/dental_burs_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd8e5f4-1e83-4dfa-8516-1f17f71763ac/gemoxodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1d00d5-3883-4c01-8edc-777ca8f8257c/adjectives_starting_with_re.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8392c557-1ab0-4aac-b720-808a5d5605f5/6764889851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80dcab27-06b7-43e9-bea2-1bdfde642ef1/59160958555.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/bank_exam_syllabus_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2abad155-7706-4780-8760-240a139708f2/mai_shiranui_deviantart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503c12f6-c818-4fbb-98e7-956b68fb82a0/90154088744.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/wosexadegufewin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4743e73c-612f-4af7-a4df-093598a8a930/el_club_de_los_incomprendidos.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_off000139bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BD 5244 bytes
SHA-256: 46f28a071a81fd62bb64f6af18c62000cb7cdcb6e4204829281b938a39621096
font_01_sfnt_off00014b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B61 12200 bytes
SHA-256: c63bc4d5cb4630b666d0997d77d14fcc52800cec9efc19ace43bf5b038221a21

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