Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20e144f02764a76…

MALICIOUS

PDF

81.3 KB Created: 2021-02-03 05:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f2fc36df8f512fe91059b05e72ea168f SHA-1: e82e9b273225deb49518ad6a3baa4502e3b4bfaf SHA-256: d20e144f02764a76ab165b552badb2d8adf26f04811aed0800f9561a1831bb17
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, contains text related to 'Macbookair6 2 ssd upgrade', suggesting a lure to a malicious website. The presence of external URIs and link farm heuristics indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=macbookair6+2+ssd+upgrade PDF link annotation
    • https://kawotubizon.weebly.com/uploads/1/3/1/8/131871780/lajajewigitu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5fdcc785247c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_60129d0fb6c76.pdfIn PDF document text
    • https://fobijolosa.weebly.com/uploads/1/3/4/7/134730704/05603e.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/b2dghWT/boomerang_video_reverse_looper.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449777/normal_5fcbd172041ba.pdfIn PDF document text
    • http://bijavamu.iblogger.org/android_studio_toast_shortcut.pdfIn PDF document text
    • http://ziratonis.iblogger.org/40451070484.pdfIn PDF document text
    • https://vofirojaj.weebly.com/uploads/1/3/1/6/131637635/defemefagij.pdfIn PDF document text
    • http://xinupavob.iblogger.org/complete_technical_analysis_course.pdfIn PDF document text
    • https://mezuxanivatanid.weebly.com/uploads/1/3/4/4/134499991/wedomipuvope.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://pavasokunise.epizy.com/20047198129.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_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 5400 bytes
SHA-256: e82cf7f66777aead735ff083842a9b2d41c65483eb40e5f72691a1957f56340d
font_01_sfnt_off00010474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 11128 bytes
SHA-256: 8bcd283277e0485355951b5232d40c8ace73311f649258791832f2b80d3e0728
font_02_sfnt_off00012a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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