Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99fc46d4c680622…

MALICIOUS

PDF

80.4 KB Created: 2021-02-16 23:24:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8b3d45e980a0fe9ea8bfedcdaea86650 SHA-1: e975466e3ce7f3cd4b3f6d39227a627b05e0dc67 SHA-256: e99fc46d4c68062262ac9a72718901915b0cd7c0e7de161db3f2dca4dcac5a3f
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 high likelihood of malicious intent. It contains an external URI pointing to 'maypoin.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a legitimate document.

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://maypoin.ru/strik?utm_term=sql+server+database+administrator+tutorial+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379733/normal_5ff2b13d49b7c.pdfIn PDF document text
    • http://sokinabunerir.iblogger.org/adobe_after_effects_learning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370307/normal_5ff9e02ea4cde.pdfIn PDF document text
    • https://xidelora.weebly.com/uploads/1/3/5/2/135296398/3487215e33f2a0.pdfIn PDF document text
    • http://danetasasanow.iblogger.org/duxifirelulagur.pdfIn PDF document text
    • http://getarileduvuda.22web.org/64233713478.pdfIn PDF document text
    • http://witotikumuw.22web.org/bitixebemewuf.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://juwijez.rf.gd/free_creative_cv_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/dagufimirovakulipezi.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/assessment_for_learning_formative_assessment_difference.pdfIn PDF document text
    • http://dojidusajotat.epizy.com/albany_georgia_weather_report.pdfIn PDF document text
    • http://gobofitis.epizy.com/aumentativos_e_diminutivos.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/29250660826.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_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 5500 bytes
SHA-256: e97c92c0308b4332efa1231f99e66dcd42fb6d67c175c57e5adec42d91c7f5ba
font_01_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 10196 bytes
SHA-256: 14a06bbdc9e60b26c79226d12842ebfe0775cd97f763c52c2f1f9f54733d592b
font_02_sfnt_off000125f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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