Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9013f1c4b159eee…

MALICIOUS

PDF

74.4 KB Created: 2021-02-23 20:32:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a6d3719baeaba600ea593c16208afcdf SHA-1: a1a77b8b6a733b8dca2b07e48374d079043d05dc SHA-256: d9013f1c4b159eee85e2a3be8b391e37fbf53a190c215aafac6957a27df70c85
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/strik?utm_term=diario+motocicleta+che+guevara PDF link annotation
    • http://papopeputato.iblogger.org/61359517792.pdfIn PDF document text
    • http://sezewadiwun.22web.org/catarina_a_grande.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370746/normal_5fe2c0b1623b3.pdfIn PDF document text
    • https://fomoxizukewoviw.weebly.com/uploads/1/3/0/7/130739072/f0b8766afeec7a7.pdfIn PDF document text
    • http://copyright-infringement.business/dofexixiregqkppy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447662/normal_600e4ae48f9fa.pdfIn PDF document text
    • https://jabiwogox.weebly.com/uploads/1/3/1/4/131453485/kifugin.pdfIn PDF document text
    • https://xudekumuf.weebly.com/uploads/1/3/2/6/132681038/labigitulopufedem.pdfIn PDF document text
    • http://ampinternational.org/datuwamozejvkp22.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/be7588ca3f3453.pdfIn PDF document text
    • https://nasaperexi.weebly.com/uploads/1/3/5/3/135351481/6753a06ad.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/jifesu/video_converter_android_pro_apkpure.pdfIn PDF document text
    • http://xigoraviwa.epizy.com/gilokuwaxiluxa.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/encyclopedia_britannica_1911.pdfIn PDF document text
    • http://jojerigexorow.epizy.com/rahul_bhai_name_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/bsf_tradesman_exam_syllabus_2019.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_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 5096 bytes
SHA-256: c98d512f7a4c30f63748fd33a331de063d6331530c3e1e88e39a1c262a63a8ce
font_01_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 11752 bytes
SHA-256: 1b5d1feef2cb5f4eaf35672e3433ff6a71de38a34f3aefb33a6db45c9ccacb89

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