Malicious PDF — malware analysis report

Static analysis result for SHA-256 be63df0b6700c37b…

MALICIOUS

PDF

79.1 KB Created: 2021-02-22 15:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 74e6c0075f52e19b9dc720ac820f90fe SHA-1: 825606a20c1628ffe14f390f38a83fcd634bed55 SHA-256: be63df0b6700c37bc51d28e56af296a983b59fd17493a224a897f09bcabcea1c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable domains and link farms, strongly suggests a phishing or malware distribution attempt. The ML classifier also indicated a high probability of maliciousness. No scripts were extracted, but the document's structure and embedded URLs point towards a malicious intent to redirect users to harmful content.

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://maypoin.ru/wix?keyword=chicago+recycling+number+6 PDF link annotation
    • http://czecheducation.space/63235340962rq5z8.pdfIn PDF document text
    • https://cdn.sqhk.co/razefudixid/jaCgeja/download_lagu_car_subwoofer_bass_test.pdfIn PDF document text
    • http://timecodes.net/kimetigaxixakemavezaverapazs4.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/brother_mfc-7840w_printer_wireless_setuplw2g7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_600e490b0421f.pdfIn PDF document text
    • https://besekexedonake.weebly.com/uploads/1/3/2/7/132741764/f80227b7c1b92a.pdfIn PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/gobolose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5fd0f21152c96.pdfIn PDF document text
    • http://tarusexozof.iblogger.org/ladusulakilinuveliwu.pdfIn PDF document text
    • http://tisigetid.iblogger.org/wynk_music_apk_uptodown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471236/normal_6031c03b2b5e4.pdfIn PDF document text
    • http://nebo-baikala.ru/sap_abap_free_tutorialsjadwj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5ff884804d487.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://xulaxun.rf.gd/10877002339.pdfIn PDF document text
    • http://lonukidoni.epizy.com/chiranjeevi_hit_songs_all.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_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 5256 bytes
SHA-256: 2dd464cb5c928646d3e76e7b2d64378c08848019c5751731f4a77d8cbca5bbeb
font_01_sfnt_off0000fe7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7C 10020 bytes
SHA-256: a83acc02f5f9a79d20ac0d07c33fe340645a37079703257f70873b8e105e556e
font_02_sfnt_off000120dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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