Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ab2eabca85e27a…

MALICIOUS

PDF

80.1 KB Created: 2021-02-20 21:24:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d322c8a92466b0060d838d742c8558fe SHA-1: dbee53a5829f3775d4fe81218bf6aaee4c783076 SHA-256: 52ab2eabca85e27a7b2bf75fbc1285672109a25eb2302abc95246d9a3755b9ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a significant portion pointing to disposable domains and employing UTM parameters, indicating a link farm designed to redirect users. The presence of a URL with 'shatter+me+book+7+release+date' suggests a lure related to popular content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=shatter+me+book+7+release+date PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374710/normal_5fdb5c98152bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373782/normal_6007465fb1f93.pdfIn PDF document text
    • http://farexirofabi.22web.org/56689973603.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/hdjiNuG/59783845265.pdfIn PDF document text
    • https://cdn.sqhk.co/konanetufuda/jdhehfY/501_3d_pencil_drawings_and_learn_to_draw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_600a3e1e3ae72.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/9chjejb/40109501211.pdfIn PDF document text
    • https://cdn.sqhk.co/gedofovel/gSxlhj4/for_guys_ultimate_knockout.pdfIn PDF document text
    • http://puliliraforuwu.22web.org/80158987045.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufelagek.rf.gd/why_should_i_hire_you_answer_quora.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/analfabetismo_digital_definicion_informatica.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/buzifosovifikedexugupif.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/geboxegegigiwimugikir.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/18730274615.pdfIn PDF document text
    • http://beruleruz.rf.gd/monthly_household_budget_spreadsheet_template.pdfIn PDF document text
    • http://durunorutap.epizy.com/cadillac_ats_manual_transmission_review.pdfIn PDF document text
    • http://siwapulozexudu.epizy.com/mimusowamusobusujufe.pdfIn PDF document text
    • http://melewurimepuja.rf.gd/vosuwozo.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_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 5452 bytes
SHA-256: b85d5555cca98b1cbe2803424d7b5055874e0d0c163fd00f9cd16712ec8ee447
font_01_sfnt_off00010a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 11592 bytes
SHA-256: 6267e5cef44fc7ec717d1054864ab34669840cc4b25fa80a95cc806a8bfd87b8

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