Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ba5a0f19afa87a…

MALICIOUS

PDF

100.1 KB Created: 2021-02-28 17:04:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6d8452d000eefe7779a4ea652e449d26 SHA-1: 910486afa6b2bb0b8cf8e839745a41a0eb956f81 SHA-256: b5ba5a0f19afa87affb6ed93354458aaed7451a1714fc2cc3383d95a1a55a9c3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one pointing to 'jottigo.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=f1+rules+changes+2021 PDF link annotation
    • https://cdn.sqhk.co/kulobibab/e0heqK9/mebasovomirozuxus.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/jbibheX/32800170210.pdfIn PDF document text
    • http://loxupudo.iblogger.org/how_to_get_a_cbs_code_for_supra.pdfIn PDF document text
    • https://lizekolu.weebly.com/uploads/1/3/1/3/131379949/bibikuvevovulo.pdfIn PDF document text
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/bebozuxuzidowu-gasisopolurab-timumibosin.pdfIn PDF document text
    • http://limebago.iblogger.org/what_is_the_smallest_gps_tracker.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/hfCZjbK/litipozapoladinupeko.pdfIn PDF document text
    • http://dusogewosat.iblogger.org/fofoluzixi.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/fazol-disixodiv.pdfIn PDF document text
    • http://wanebori.22web.org/types_of_levers_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/lasijutag/adperFL/sutimodutiwudisajolazomeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://japixivi.epizy.com/capture_one_sony_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/ravoxiwadi.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/online_shipping_company_website_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/56028784607.pdfIn PDF document text
    • http://porilebunenagu.rf.gd/percy_jackson_the_battle_of_the_labyrinth_download.pdfIn PDF document text
    • http://vazuxonedadid.epizy.com/38872448566.pdfIn PDF document text
    • http://pakafadudu.epizy.com/15122157653.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_off00014580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14580 5344 bytes
SHA-256: 280a927b122332d48d2bdb3e4abde7d426d9fc1092cfbcd3822495cb1ce55537
font_01_sfnt_off000157ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157AB 14092 bytes
SHA-256: deac1b54ce8c66d59bd3287f3140e13270731a4e2138233d5a0cdcb284b21d06

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