Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3a4abf31602506…

MALICIOUS

PDF

87.6 KB Created: 2021-02-23 23:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 44caea86bff7bffdcf137bb6baf80eea SHA-1: a71ba17a4382da2b273d9c5bac70a35cd2cd39d0 SHA-256: aa3a4abf31602506d32df196d6da0ac541bffae581d138c63c3e69ad2d1b1aee
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to downloading a PDF. The presence of multiple disposable hosting domains and UTM parameters further suggests a phishing or scam attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=the+complete+star+wars+encyclopedia+vol+3+pdf In PDF document text
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/94487f3092.pdfIn PDF document text
    • https://kexanitafax.weebly.com/uploads/1/3/0/8/130813084/b0a35f47d59.pdfIn PDF document text
    • https://vopifubuk.weebly.com/uploads/1/3/1/6/131636719/1249475.pdfIn PDF document text
    • https://cdn.sqhk.co/lekuruzomef/idgewhg/demon_hunter_dungeon_gift_code.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/eohjFO4/47099339606.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://dopatujijidami.epizy.com/que_es_digitalizar_una_foto.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/appointment_letter_format_for_medical_officer.pdfIn PDF document text
    • http://bavabime.rf.gd/aftermath_english_movie_free.pdfIn PDF document text
    • http://jixenefotudak.epizy.com/ielts_listening_test_sheet.pdfIn PDF document text
    • http://rofizamomu.rf.gd/paggamit_ng_malaking_titik_at_bantas_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/dewubovoripegiruv.pdfIn PDF document text
    • http://nimunofat.epizy.com/jijazolofejoxekitar.pdfIn PDF document text
    • http://pozujig.epizy.com/91827169623.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_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 5552 bytes
SHA-256: 2d9aca56e0d8b8b45b41ebac599419d598850eeb3ac01c104ee3e53ae971161b
font_01_sfnt_off00011da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA2 11044 bytes
SHA-256: 44b1ed6d530e003382d46cc0e1c375b691b87053af8283f40505b5c14eafbfb4
font_02_sfnt_off00014347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14347 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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