Malicious PDF — malware analysis report

Static analysis result for SHA-256 7953e4ffc1f71dd4…

MALICIOUS

PDF

81.2 KB Created: 2021-01-03 06:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a9af660b3ebb8a686b5c7128f51adf22 SHA-1: 2550a8effeb91a9b1fdb92e441b5e2fc71186236 SHA-256: 7953e4ffc1f71dd40a213633eac7ffe17d5dccd36f401dcd25f3f810d97d2b1a
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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?utm_term=report+writing+contents+page+example PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459784/normal_5fac213ae816d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428052/normal_5fb4648b37696.pdfIn PDF document text
    • https://cdn.sqhk.co/xoradofexul/gkhehdg/nodenolinemewipak.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/OWhi5ih/jiforujojigetazetusomotuf.pdfIn PDF document text
    • https://tugufotekaluxaz.weebly.com/uploads/1/3/4/8/134883762/nozokoxar.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://uploads.strikinglycdn.com/files/64777373-95c8-4471-ad86-2d94aa64280e/31036402564.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/sohm_al_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b27022-ebc0-4c66-bf2f-ca4e5a3fb50d/open_water_diver_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5085162-b918-425b-9c85-c9e2d3d1a069/ikea_swivel_chair_white.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/bavuvim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f29abe-8add-4620-a974-02ab7b3f417c/zaluz.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/material_approval_request_template.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_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 5208 bytes
SHA-256: a2491f77b54b3cb81e79c44e6b197aac08087fdb9fe654f2dcf83cc7d57aa296
font_01_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 10612 bytes
SHA-256: 6bdb44d28d6286d15a574ab624c0ba053a58d2908ca9224d14310facd02c9a3c
font_02_sfnt_off000129e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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