Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52cca6beb98986c…

MALICIOUS

PDF

65.3 KB Created: 2020-11-10 14:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: cf1c188ca6b573c5932da0af5f471cdd SHA-1: 4e7a7a227c512e826e5e773a6af12e18e7fa0113 SHA-256: a52cca6beb98986cbdf7a5cac03734de119a25b1ce56092387e2a8a797bbba59
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a link farm of numerous PDF documents, with one link pointing to a known malicious redirector. The document body text is heavily obfuscated, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted from this sample.

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://cctraff.ru/123?keyword=words+with+the+prefix+graph+in+it In PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/likovero-lowusa.pdfIn PDF document text
    • https://vegilirebaj.weebly.com/uploads/1/3/1/0/131070576/wozafosiza_pefalix_molevutofasenir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f892a5b6b3ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_5f8fb8e984e6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5f8c868775bf1.pdfIn PDF document text
    • https://dufejubodumafeb.weebly.com/uploads/1/3/4/4/134444341/8af7b7928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_5f8c9b853531c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_5f9b3779018f1.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/gexixixuda/47676373316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da649332-0239-478f-8148-a39c41f41b75/33775505147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bee44b3b-eca0-480e-9383-7f37aac7dd37/58360064743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/875f364e-d941-424f-b572-fe31349db658/75756401595.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/yahoo_mail_sign_in_homepage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bed546aa-bfef-49b9-bd7c-49cd2f725995/86558949247.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_off0000c512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC512 5444 bytes
SHA-256: ff49b120cf8ad5a2b6dcfe427275105fdf33a7fb14ab04d7758147905e915af3
font_01_sfnt_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 9612 bytes
SHA-256: cb6ed0495e5379914d83b80a99366fb1aa26439e9bb9efbbbc5d0e9d7de0a559

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