Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f9a39b890bfda6…

MALICIOUS

PDF

140.9 KB Created: 2020-11-10 13:23:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 91fa8ebcc0bbbabb6336bf5cc5cd5f8c SHA-1: 547439dcfb31ce6765b917e4dfaa203c1fa0035f SHA-256: 95f9a39b890bfda61f6c2fbdb08437131d3a2fac5db87928ed92584765f1bd1b
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://traffine.ru/aws?keyword=samsung+gear+s+manual+download`. Additionally, it exhibits characteristics of an MFA lure, suggesting an attempt to harvest credentials or session tokens. The presence of numerous embedded links, many pointing to S3 buckets, indicates a link farm designed to improve search engine ranking for specific keywords, likely to attract victims. No scripts were extracted, but the overall structure and heuristics point towards a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/aws?keyword=samsung+gear+s+manual+download In PDF document text
    • https://xipazodi.weebly.com/uploads/1/3/4/3/134375507/raxuwawa-xivurifek.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/mowasafiv-xezuvazirawidu.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/tojipefiliwizuniped.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f94d8b9664c7.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/jifesu/binomial_distribution_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/47251112165.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/25006141547.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/16061234457.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/dezogopipad.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/nonulatojixizom.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/zamixubifewewuramejo.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/shun_nakiri_review.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_off0001dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBD0 2968 bytes
SHA-256: c3535dd41476eebf6ac32815e39482f32909ce4a3dab0c33feaa9cf7a3447b7d
font_01_sfnt_off0001e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E665 5340 bytes
SHA-256: d8cb7ac72f080c9f8d5a9b92c03f655f7670db1aa60036fe81f9c73ee1a3fc90
font_02_sfnt_off0001f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F87E 14244 bytes
SHA-256: f592cf1d129b4356eaf1368c64b0a90a99f0966a19ed2e371f5e3560f7be4163

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