Malicious PDF — malware analysis report

Static analysis result for SHA-256 48153cb029ce5415…

MALICIOUS

PDF

72.2 KB Created: 2021-02-13 21:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7cebd2b4c01e0ad0f66ba3eca5043842 SHA-1: a66d57c8e13232e49c9ff380db17c686a82a02d0 SHA-256: 48153cb029ce54153250b82027b5679f6f28914902c09c1ea037911b7a66d8a5
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=la+virgen+sue%25C3%25B1a+caminos+con+acordes PDF link annotation
    • http://bonus332.site/world_cup_2018_table_groupf40v2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386094/normal_600342e245ff8.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/cY9lRjb/32866050747.pdfIn PDF document text
    • https://lebotowim.weebly.com/uploads/1/3/1/4/131438344/1621444.pdfIn PDF document text
    • http://endi-itali.space/technical_drawing_with_engineering_graphics_free_download6r4qg.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/hejbgh4/gifabopilobosakujesisex.pdfIn PDF document text
    • http://supermagazforsale1.xyz/money_making_guide_bdo_2018gjq26.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/thrombolysis_stemi_guidelines_australiaobk7l.pdfIn PDF document text
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/zegukapogagiji.pdfIn PDF document text
    • https://tuvitewolejuxow.weebly.com/uploads/1/3/4/6/134615754/2191698.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/ifjbjdV/87844132298.pdfIn PDF document text
    • http://eurosett.net/52477599012u3t2l.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/nefagolom/immortality_bee_gees_piano_sheet_music.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_off0000cf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF43 5440 bytes
SHA-256: e8e2d7b058fec1534654a162df93fa6573758e74ad08697a5e4b3d9026cc10ca
font_01_sfnt_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 2140 bytes
SHA-256: 79e709b2212f1ccf53abe2f7012691488ac511adee704ed23d122fa2ddd0508d
font_02_sfnt_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 11736 bytes
SHA-256: 29d0f897676919f0e51daa2283ee7efba97e14b46663e1f812315b8e01663a4c

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