Malicious PDF — malware analysis report

Static analysis result for SHA-256 3203fa5ba6c8c4a3…

MALICIOUS

PDF

92.1 KB Created: 2021-02-23 23:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 66b87abb0e47c497ceb4806df01fc757 SHA-1: ad2f534847a9bcf1ce51310780e98c80ee243c5c SHA-256: 3203fa5ba6c8c4a355d5b0e6e63ce05b5760bb32a408683736cbf8b6ca76fb88
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and a link farm structure suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful content.

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://druttle.ru/wix?keyword=ap+environmental+science+module+24+answers PDF link annotation
    • http://front-glass.website/684516518127q857.pdfIn PDF document text
    • http://premial.su/707763427819ke2j.pdfIn PDF document text
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/9669503.pdfIn PDF document text
    • http://polnews.xyz/loludovga6ur.pdfIn PDF document text
    • http://hookup158.fun/cartoon_song_mr_jattybhqf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381737/normal_601f72631dabf.pdfIn PDF document text
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/f4e123f64.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/cpDI7Eu/dragon_city_chinese_menu_doncaster.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/Stfj2ji/fokowekomusotekatalase.pdfIn PDF document text
    • http://gayerkan.com/693740322366bwk4.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/wunupalezozerud/95939337460.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/14548129061.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/architecture_map_software.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_off00011ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 5580 bytes
SHA-256: c8592d8b76049e0fb34bd8091909b953b30d50dff526297fa9497c43fe2ecc4b
font_01_sfnt_off000131d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D4 15184 bytes
SHA-256: 69dc4cf95287cc5dfe0ca1125ede74b2d2f9b1f2325eb362875be5e6ee50076f

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