Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec543e8e515fddcb…

MALICIOUS

PDF

68.2 KB Created: 2020-12-20 19:18:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8c5551ba7582a6027d4e73032b130439 SHA-1: ebbf7171bfd5f9df3de85dda9f652531c41ea695 SHA-256: ec543e8e515fddcb8983fba7dd1154396155472c4be5ce39be558715687d558a
222 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous external links suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/strik?utm_term=types+of+pollution+printable+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_5f9aedf492bfa.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/1c5788902ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421365/normal_5fd369814dff1.pdfIn PDF document text
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/db3c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd745bcb0228a2824d01/t/5fc21fe3645712565484916d/1606557668014/diganolemufetal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d14bb1c-ad8a-4fe4-9a77-a7d272bd7763/dls_19_brazil_profile._dat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b8e463c-471c-40fd-ba16-a1c6562ba3d8/17882249525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfcbbdd0-7e84-4e1d-aff6-75e985804b60/pusakuxojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4090859-3c96-4bf5-a633-d88319f7c878/lesebulajubuxup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1468d89c-701b-4eb7-9a0e-217fd56646ac/95836613038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd671a4-7e62-42b6-bb42-a6e8d1e43145/15711653021.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_off0000cd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4E 5336 bytes
SHA-256: 8f513ffc991589e663d3fcf0566404f0ae1c72cadb358c17f03809a4462befd0
font_01_sfnt_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 10692 bytes
SHA-256: 32999ca47ed6eb6a1dc6a99af2592e787f75f5fe94788922bde4d15cdeb63233

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