Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8a7f7b05141ef6…

MALICIOUS

PDF

79.3 KB Created: 2021-02-27 02:08:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b74d972878496ae14208843a4f5db93d SHA-1: 51e86ba9f8c6f01f3e4b4517bd5ed4b5b9bd8450 SHA-256: bc8a7f7b05141ef651530e9582e9f1f296a53bf9fc4a7bc275236881599cdc8f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish credentials. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=good+night+gorilla+story+pdf PDF link annotation
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/xigunawidu.pdfIn PDF document text
    • http://nudevego.iblogger.org/4509062214.pdfIn PDF document text
    • http://zoxovimukanig.22web.org/100s_chart_printable.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/proportionality_graphs_worksheetk66ni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481068/normal_60166e3879d4a.pdfIn PDF document text
    • http://bupojew.22web.org/37323470644.pdfIn PDF document text
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/dopup_wovodiperanefe_wugevowifulusob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://sugexure.rf.gd/austrian_chevauleger_uniform.pdfIn PDF document text
    • http://biwevugiwuk.epizy.com/cisco_dpc3825_firmware_hack.pdfIn PDF document text
    • http://rubujizuz.epizy.com/wigumowitizetipemeguxeman.pdfIn PDF document text
    • http://memujagitukeza.epizy.com/sap_bods_designer.pdfIn PDF document text
    • http://tasefabomodewiv.epizy.com/how_many_school_objects_worksheets.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_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 5436 bytes
SHA-256: 601c6544b5922af0b766d5a358f75cadb41e022ea75203f22533c4b36f497f8c
font_01_sfnt_off0000fb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB12 6220 bytes
SHA-256: 85309898dd6aa7131562a04e7a84271aa766dd6e0ae36fe1b546730a23c6f712
font_02_sfnt_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 10332 bytes
SHA-256: d5d354c8789b57cd658423035bf272dd74ed48f9251dd0695cb58bcf32d09513

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