Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e0572069b9497b…

MALICIOUS

PDF

68.8 KB Created: 2021-02-26 07:02:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3f7534dd392c96d18c6450b20a425d0b SHA-1: 77813fed15ff12532da8d0d1c87868cf413e523e SHA-256: 55e0572069b9497b3a101ea9bf9dea7b3585a66bed38672d7f11f9e7f7c782a6
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm hosted on disposable domains. The embedded URLs, such as 'https://jacksth.ru/strik?utm_term=is+there+going+to+be+a+sequel+to+nancy+drew+and+the+hidden+staircase', are likely intended to redirect users to malicious sites for further exploitation or phishing. The document body, though heavily obfuscated, contains text related to a movie sequel and the wkhtmltopdf tool, suggesting a lure to disguise the malicious links.

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://jacksth.ru/strik?utm_term=is+there+going+to+be+a+sequel+to+nancy+drew+and+the+hidden+staircase PDF link annotation
    • http://quinzsy-studio.design/dibrugarh_university_bsc_botany_major_syllabus0wiso.pdfIn PDF document text
    • http://romeita.space/vubekiwologoh0zot.pdfIn PDF document text
    • https://ralerafuzirepob.weebly.com/uploads/1/3/4/3/134386916/b1ba7d408372058.pdfIn PDF document text
    • https://pogosarixuxa.weebly.com/uploads/1/3/0/7/130776079/xezovo.pdfIn PDF document text
    • http://habirovradik.ru/bhaijaan_elo_re_bengali_moviesfw46k.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/fetibu.pdfIn PDF document text
    • https://doxezasofe.weebly.com/uploads/1/3/6/0/136088479/7603446.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471691/normal_5ff7610b154f5.pdfIn PDF document text
    • http://sparzha.club/zujaripigunakelisintsq0.pdfIn PDF document text
    • http://astropsychology.site/166743670287i21q.pdfIn PDF document text
    • http://testrun.ru/50967728809g3s04.pdfIn PDF document text
    • http://ourfanz.com/los_24_tiempos_verbales_del_ingles_completo1czvl.pdfIn PDF document text
    • http://odemebayisitrafik.com/17076008123n85sq.pdfIn PDF document text
    • https://kevanosum.weebly.com/uploads/1/3/0/9/130968994/pazolevebodo.pdfIn PDF document text
    • http://bristol-yalta.run/81908065094xuasc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ce02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE02 5600 bytes
SHA-256: 31e01a26635b17d476835f571674edba5923d4ae2990a08517b217859ccbc92f
font_01_sfnt_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 10748 bytes
SHA-256: f2a6fa1aae8f10c3e5193e5026dce3d578eca1b1be2729238d84cf13734281c0

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