Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc51eb49d02648fd…

MALICIOUS

PDF

76.6 KB Created: 2021-02-23 03:19:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aeff199abef8a3196d9e6994f4894f46 SHA-1: 97ba356bcb92e0dfa18f267b66a698a43d8ee81b SHA-256: bc51eb49d02648fd28b2ab705882baaceb1676904c0f354fce65b74c453778b2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=how+to+make+your+sim+angry+cheat PDF link annotation
    • https://xewaxamuroz.weebly.com/uploads/1/3/4/5/134529724/wekuviporumuloki.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/tieiica/dejit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467278/normal_601d21824bd93.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/idWhhhb/paper_knights_2_recipes.pdfIn PDF document text
    • https://mupexopuwes.weebly.com/uploads/1/3/4/7/134722910/kugusigeduxufa_pawakibix_baxakusojelibud.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/piic6ja/wixoxaku.pdfIn PDF document text
    • https://kufuzuve.weebly.com/uploads/1/3/4/5/134589172/jawor.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/jjjjbgi/68866065268.pdfIn PDF document text
    • https://cdn.sqhk.co/penunotati/TA7nPXK/ecac_hockey_playoffs_2020_results.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/gN67nEu/makagugogujerugelefiboza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemerolafun.epizy.com/financial_reporting_quality_and_idiosyncratic_return_volatility.pdfIn PDF document text
    • http://tadabafilebe.epizy.com/how_to_write_an_aim_for_a_lab_report.pdfIn PDF document text
    • http://nexaware.epizy.com/painting_estimate_template_excel.pdfIn PDF document text
    • http://lukegijabezul.rf.gd/posoxomobade.pdfIn PDF document text
    • http://jefevuxivux.epizy.com/vipazosuxiwu.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_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 5400 bytes
SHA-256: 84736adc50b8daa5e3a199bf24699f68d15928707e9ae4c893de763611a548c4
font_01_sfnt_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 10112 bytes
SHA-256: 61e22f040d2f34f5bdb26b468e2b4273f80cc77f9e83b332566d0dda21dd1b34