Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef57a844824a373…

MALICIOUS

PDF

81.1 KB Created: 2021-02-16 00:37:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 26eaae1e55ad83523e8b8cce45f144f1 SHA-1: 8d26021aa8af161cdb780032e9ab93c90e22de4b SHA-256: 2ef57a844824a373bfd4efeb94bf0d4841f6e39be2f75e5478b4f3bab7df24a5
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution lure. The PDF's structure and the presence of external links, particularly those with UTM parameters, are characteristic of phishing campaigns aiming to redirect users to malicious 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://baarspo.ru/strik?utm_term=can+you+text+on+the+jitterbug+flip+phone PDF link annotation
    • https://cdn.sqhk.co/pojuzijix/gqwhjbi/46520595283.pdfIn PDF document text
    • http://videohost.space/89734722129w8az6.pdfIn PDF document text
    • http://tumerasiwabuzip.22web.org/8297285461.pdfIn PDF document text
    • http://liolika-rsya.ru/78793285644qri2p.pdfIn PDF document text
    • http://m-laskin.ru/first_words_book_the_works0n8w0.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/Hiagg4Z/banco_do_brasil_pessoa_juridica_gerenciador.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/jcgifjc/7192143942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_600fd0f4d4ebc.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/hfKhitL/farm_animals_names_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/eibjeVE/kits_para_dream_league_soccer_2020_del_barcelona.pdfIn PDF document text
    • http://bcipreactivaperu.com/bugsy_malone_full_movie_freeruqoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gabozimipuz.epizy.com/36534623667.pdfIn PDF document text
    • http://patabajisof.epizy.com/vomagej.pdfIn PDF document text
    • http://zikomum.epizy.com/rpg_maker_vx_ace_lite_free.pdfIn PDF document text
    • http://lagunuriteg.rf.gd/91016586170.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_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 5276 bytes
SHA-256: 6d25a519271930b2ce5f18c117215044a781d2e6cdde272f83a6168c8106454b
font_01_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 10696 bytes
SHA-256: 51079096dd0724b9815c47add7d9ec8f7dccb2c180945af80cd59e76b5ad6780

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