Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc99ebb135021039…

MALICIOUS

PDF

63.4 KB Created: 2020-11-10 22:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 61989238733bad91722e7f649d74b15d SHA-1: 1591f5414eb5097071cf20e6f9b611cdf197c478 SHA-256: dc99ebb13502103968b0244633e57bf0daefe13867c0e4fdb7fa40c3c14738f5
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least two identified as malicious redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a deliberate attempt to direct users to harmful content. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing and trojan classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?keyword=train+simulator+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_5f8f2dde8681b.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/lefiwuviginelu_vijojiz_vajoji.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/fomaxebi.pdfIn PDF document text
    • https://nukafezika.weebly.com/uploads/1/3/4/5/134510633/62324e37.pdfIn PDF document text
    • https://vimadefivikimaw.weebly.com/uploads/1/3/4/2/134265378/pimibazisagejasit.pdfIn PDF document text
    • https://titenukom.weebly.com/uploads/1/3/4/5/134523185/sotejubido.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/befarekogol/puganuweg.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/63308367733.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/77146660075.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/20263565304.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/bid_rent_theory_aphg_example.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/bhaktamar_stotra_in_sanskrit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB264 4816 bytes
SHA-256: fbc363d363556d189969033a20cec2ebacd8a54121b11a7ea3c6e0b9a4c485c2
font_01_sfnt_off0000c290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC290 9576 bytes
SHA-256: a366250df96d75d8c49a461b9b8b3c5ef108336f23bf323421a6a69b35049ecd
font_02_sfnt_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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