Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bb3c7cbd81f2d0…

MALICIOUS

PDF

68.7 KB Created: 2021-02-18 06:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d0998090e0537c38a6210ad40eacfaf9 SHA-1: 408f11c190509ddf2afac10e19951f985aabd824 SHA-256: d3bb3c7cbd81f2d0091efdb853c75ca0ecc7c8d76d098438eae958b94ae391a9
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying them as pointing to malicious redirector infrastructure and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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://yafferge.ru/strik?utm_term=major+scale+construction+worksheet In PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/4ba5d519076c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5ff09551dda82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5fe9e0bbc95c0.pdfIn PDF document text
    • http://cherrypimp.online/worm._io_crazy_gamesqar2x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494452/normal_600a1c8540687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414336/normal_6026ec27124ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5fe7c8d955ad5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_6010321dbf8b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380403/normal_5fffd9321f49b.pdfIn PDF document text
    • https://sexomimafu.weebly.com/uploads/1/3/4/3/134311134/9797751.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/fosawef/81470792437.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/nevadijamisumupi.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/bootstrap_button_onclick_submit_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/ganojafijol.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_off0000cdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEA 5124 bytes
SHA-256: f55924965ebfc279260f2fb01960079259560afbb6dfb581d029b8d126164ca6
font_01_sfnt_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 10704 bytes
SHA-256: 62dee89b7b52524895d9b1f3a9e9ff33537357887c1dd9adc341916754fb4890

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