Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee465a7423fd407c…

MALICIOUS

PDF

76.2 KB Created: 2020-11-11 05:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea683f183a6fd13c8e55bd25b7b5a05f SHA-1: 171e84e4c5f4fd0ab9d03ab4f9dc530f0a36aa2c SHA-256: ee465a7423fd407cdad41275e322ab3a378074c428abaf9f88edb6a727ae1315
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a method to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or content-luring attack, likely using embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?keyword=holtzclaw+ap+biology+reading+guide+answers
    • https://cdn-cms.f-static.net/uploads/4382413/normal_5f8c70456e67f.pdf
    • https://kixatefibav.weebly.com/uploads/1/3/0/7/130776592/4425397.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rebomedug/vexifusamoleveriviva.pdf
    • https://s3.amazonaws.com/sifawekujiki/kuboludomile.pdf
    • https://s3.amazonaws.com/fefurorobumi/what_is_smartbyte_network_service_windows_10.pdf
    • https://s3.amazonaws.com/zepifudoxapo/5337457517.pdf
    • https://s3.amazonaws.com/magapeguwabe/20th_bluebook_citation.pdf
    • https://s3.amazonaws.com/gapivegek/wow_jewelcrafting_leveling_guide.pdf
    • https://s3.amazonaws.com/liguwubore/28001212992.pdf
    • https://s3.amazonaws.com/bifadiwuwileji/bullitt_east_high_school_website.pdf
    • https://s3.amazonaws.com/wavunot/vidale.pdf
    • https://s3.amazonaws.com/xotorulu/words_that_start_with_lady.pdf
    • https://s3.amazonaws.com/zirojopemup/69853252220.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/kuzovijasowopifu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf19.bin
10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 2900 bytes
font_01_sfnt_off0000d95c.bin
a98ea5672ed2ecc175c1f87ae443749538778d0c6e5ea96cd744aaf9ff5a15bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 5468 bytes
font_02_sfnt_off0000ec0e.bin
fc3d28c0bea29b0e1a15f8dc05811b9ba5dfe0b2d21e92b098bfafa6edfc718f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 11644 bytes
font_03_sfnt_off0001139e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 4324 bytes

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