Malicious PDF — malware analysis report

Static analysis result for SHA-256 879342e53d6c971f…

MALICIOUS

PDF

156.7 KB Created: 2021-02-16 16:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9eca1f7dba8fedf6390f29e8ea646f80 SHA-1: d26a8c6c240febbc452cfd8bef5d632d9b056143 SHA-256: 879342e53d6c971fa66323c36ddb943464bb471cfd1e1d6a9f11745259afb84f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure of a deceptive link.

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://baarspo.ru/123?utm_term=que+es+estado+social+democratico+de+derecho PDF link annotation
    • http://wukosemat.22web.org/cabinet_battle_2_worksheet_answers.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/1206167.pdfIn PDF document text
    • http://lovechat24.club/king_of_my_heart_piano_sheet_music_freedriiy.pdfIn PDF document text
    • http://potolkilife.ru/chrysler_sebring_2006_repair_manualwwv2u.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/hifBAhi/21543856118.pdfIn PDF document text
    • http://pe50off.pro/90556815402ez7ic.pdfIn PDF document text
    • http://bodyita.space/genovudoboxesurelibutudiv92i7q.pdfIn PDF document text
    • https://dimegowogox.weebly.com/uploads/1/3/3/9/133999821/9c9d7c3df.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/2948837.pdfIn PDF document text
    • http://polfact.site/82289278667iq8hv.pdfIn PDF document text
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/48f06f3c91e7.pdfIn PDF document text
    • http://xoxibusu.iblogger.org/40604922070.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refewebol.epizy.com/48449945253.pdfIn PDF document text
    • http://kezitiw.epizy.com/90575835354.pdfIn PDF document text
    • http://nuvijexuwafado.rf.gd/48114496106.pdfIn PDF document text
    • http://safagapoz.rf.gd/zagajasurivetifaloga.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_off0002283b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2283B 5240 bytes
SHA-256: eca6663ed8e3f497fe114d36d6ae244ffe834375e67c64664f4f0fba83259074
font_01_sfnt_off000239da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x239DA 12644 bytes
SHA-256: 84083b1a3bca9829ae7120af6fc52eac2c33c0ec2b2679917801b53f9eb43472

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