Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35b628d2bfd8f33…

MALICIOUS

PDF

73.2 KB Created: 2021-02-26 20:18:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5c630475fdcd1cd70de746298e73a7a4 SHA-1: 0c40b536213c57d2226a51f4832a8d8ef7eae40d SHA-256: d35b628d2bfd8f333d0e89ad615d75203c6459b838dadae08d57f3541c1eab8b
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing attempt. The document body, though heavily obfuscated, contains a URL that appears to be a lure for users to click on, likely to a phishing site. The presence of numerous external URIs and a link farm heuristic further supports the malicious intent.

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://dugedepap.ru/123?utm_term=can+you+renew+your+cdl+license+at+aaa PDF link annotation
    • https://toruvorunivigu.weebly.com/uploads/1/3/5/3/135317855/b8c4642f.pdfIn PDF document text
    • http://pek-24.cc/lewituvozurovisizwiqd.pdfIn PDF document text
    • http://anrostore.ru/66951669800vjnwz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374839/normal_5fcd96ee30015.pdfIn PDF document text
    • http://55571.ru/coyuchi_organic_sheetsbly2x.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/eqhhieY/21296159083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481516/normal_60365b4aba97d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445326/normal_6007a4b562124.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_5fe5ee7dcb129.pdfIn PDF document text
    • https://popogupu.weebly.com/uploads/1/3/1/3/131398113/9005249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417656/normal_601ddbedb2acc.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/XFhfqif/give_me_directions_to_bowling_green_kentucky.pdfIn PDF document text
    • http://bnatural.space/motorcycle_diaries_summary_moviexwa0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/weather_report_jazz_band_members.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/early_management_stroke_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/13145292536.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_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 5032 bytes
SHA-256: c969166b42457e9cf7da895a4d20cdf7db4db5a8004d5a2e599f0e3e23954fd3
font_01_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 10816 bytes
SHA-256: e15cc118c96d5109acddb460d9db0ead5bd55bb653a433b53723ec7b1a0a7425

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