Malicious PDF — malware analysis report

Static analysis result for SHA-256 d227c41b9bd92828…

MALICIOUS

PDF

113.0 KB Created: 2021-02-21 01:49:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4c723f511e0a28fd3b7605561dd6128c SHA-1: 2044a52e8765f787c9224a0e6724c0d06d8231ce SHA-256: d227c41b9bd92828caeeb70734b3589155f26bdaa79aa1a884a4d10156cc81cd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://jacksth.ru/strik?utm_term=problemas+pol%25C3%25ADticos+en+m%25C3%25A9xico PDF link annotation
    • https://cdn.sqhk.co/nuvurero/YCjfjfs/idle_egg_tycoon_mod_apk_1._5._2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_60308c50bba9f.pdfIn PDF document text
    • https://cdn.sqhk.co/semubedogi/gjhbCib/funny_pet_photos_with_captions.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/ijjiiih/live_streaming_apps_for_iphone_free.pdfIn PDF document text
    • https://jelezasi.weebly.com/uploads/1/3/5/3/135347821/woxasupumitobezaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393514/normal_5ff7f40757801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_5fe672077f552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409103/normal_5fdbd011cce1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479684/normal_5fc9f9a7ddfa6.pdfIn PDF document text
    • https://salofapaj.weebly.com/uploads/1/3/4/3/134314320/4447590.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/oAhiNgc/bixejupabilosipi.pdfIn PDF document text
    • https://cdn.sqhk.co/notigagamu/M3iaNhb/make-_up_meaning_in_kannada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443578/normal_60308d408ba36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375705/normal_5fcf1efdab566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452618/normal_6015b6209b4c7.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
    • 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_off000163f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163F3 5272 bytes
SHA-256: 95fcc8112c88fac7270142ce9d8a4d0e1eba8c014f2557746e4231cad0eadb0a
font_01_sfnt_off0001756d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1756D 16788 bytes
SHA-256: c19fd8ac3c414aaef52564d15bdcaa10986f6be8f11c438972966e789a8f663f
font_02_sfnt_off0001a688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A688 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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