Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b52eb5195bbba36…

MALICIOUS

PDF

103.0 KB Created: 2021-02-22 09:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8e22af7980444b4cbd201482f91b4240 SHA-1: 91144491664a59af76c96648413277c3388c66dc SHA-256: 4b52eb5195bbba36f911178e712fa0fdfd8e0e91627b9834dacba5fc6a3e4cc1
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

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://druttle.ru/wix?keyword=pathfinder+kingmaker+metamagic+mastery PDF link annotation
    • https://xujopikaxatanow.weebly.com/uploads/1/3/4/8/134850499/f345f75.pdfIn PDF document text
    • https://dosabaret.weebly.com/uploads/1/3/4/8/134861273/84ca5.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/M3pjjif/download_synthwave_run_mod_apk.pdfIn PDF document text
    • http://niluxedofodip.22web.org/waterfall_methodology_vs_agile.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/jhj1zIx/diamond_clicker_earring.pdfIn PDF document text
    • https://gelowoxolup.weebly.com/uploads/1/3/4/7/134703814/57aff5a9f.pdfIn PDF document text
    • https://lelibajoterudu.weebly.com/uploads/1/3/4/0/134042739/nuvon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_5feaeb4d179a9.pdfIn PDF document text
    • https://cdn.sqhk.co/laxepinam/fWZxhiy/ski_safari_adventure_time_apkpure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuriwafu.epizy.com/aashiqui_2_songs_lyrics_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/99747863999.pdfIn PDF document text
    • http://rolaxaja.rf.gd/figogebuweburin.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/ketojedazanaxubiji.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/can_diabetics_have_complex_carbs.pdfIn PDF document text
    • http://bimokiteguzosuw.rf.gd/navy_diver_suit_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/dark_navy_blue_formal_dress.pdfIn PDF document text
    • http://tomunipi.rf.gd/sipeed_k210_datasheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000157d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D5 5568 bytes
SHA-256: 684a2a0d44cfd0b1f638d39ac1c59e6febcf8ac9139e501e12f5b86f06b50733
font_01_sfnt_off00016aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AAA 10416 bytes
SHA-256: d369a372148b45f374bd7bf42029c355dddaa70537b8d5b2c1ac644dd2f82630

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