Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2468a4fa73a342…

MALICIOUS

PDF

75.3 KB Created: 2021-02-16 22:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9f165af80c2158baed2b08e10519ecd6 SHA-1: c4c44eab5eadb87c328f9de76a1c10c41569b2d4 SHA-256: bd2468a4fa73a34234f2a2c1c65c3ca738cb2e403e909d2e74133881a02f5f04
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The document body text is garbled, but the presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/wix?keyword=printable+basic+french+greetings+worksheet PDF link annotation
    • http://walafim.22web.org/checkrein_deformity_treatment.pdfIn PDF document text
    • http://birodavaz.22web.org/55270785766.pdfIn PDF document text
    • https://sadavofabuloxus.weebly.com/uploads/1/3/5/3/135316226/kefaweba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481695/normal_5fd7accd7c42a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_6019877339d5d.pdfIn PDF document text
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/rinilobasa.pdfIn PDF document text
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/5016ff996.pdfIn PDF document text
    • https://duzobiwaroliwu.weebly.com/uploads/1/3/2/6/132696147/f74cdb456e0cf1.pdfIn PDF document text
    • https://voxonevixes.weebly.com/uploads/1/3/4/3/134383310/gasiravasazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_600e0f47b81ff.pdfIn PDF document text
    • https://vuguzunorofina.weebly.com/uploads/1/3/4/3/134322364/03af348.pdfIn PDF document text
    • https://tiwudusakuwizir.weebly.com/uploads/1/3/1/6/131637104/gewesixodex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421224/normal_60228e3c7623b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420025/normal_5fea0165b86f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5fd934129a00f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://demevobofimozu.epizy.com/date_sheet_ba_2019_ajk_university.pdfIn PDF document text
    • http://vujulazi.epizy.com/weather_report_of_daltonganj_jharkhand.pdfIn PDF document text
    • http://wimidisa.epizy.com/bezutexixuzokugewawu.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_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 5440 bytes
SHA-256: 73f9f8e2fc6647607dd1bea8f36ac33c1d0550b3e4d834fa697020210ccf5d6c
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 10520 bytes
SHA-256: fc3bc077d7ae26b3bbb45db3e058a566e375618760da5ab0f00e982c7db0f885

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