Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3617c91c2a9bbb…

MALICIOUS

PDF

93.8 KB Created: 2021-02-26 14:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8ba575305f71b944d0007bad9ab1aa0f SHA-1: adfdeb530f8791355deb0e1a8ff94b6fcef77793 SHA-256: ac3617c91c2a9bbb7c2285ad9e35199e0be1ad1d6ad432112eb2e8ab59f32a13
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

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://maypoin.ru/strik?utm_term=is+moff+gideon+a+mandalorian PDF link annotation
    • http://lizowaw.scienceontheweb.net/hp_probook_6560b_fingerprint_driver_windows_8.pdfIn PDF document text
    • http://top-odejda.com/694879350195bvi7.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/62567695763.pdfIn PDF document text
    • http://instas.site/losovisugisulmj40.pdfIn PDF document text
    • http://vkysnaya-eda.site/ttv_apk_download_freeio6eb.pdfIn PDF document text
    • http://lalat.space/masasuxudiwitakovemn9e2.pdfIn PDF document text
    • http://beststudent.space/place_value_worksheets_grade_140gi4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465003/normal_60223c38558a1.pdfIn PDF document text
    • http://myyshooop224.site/pluraleyes_4_serial9578h.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/xuzel.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/why_wont_my_versa_lite_pair_with_my_phone.pdfIn PDF document text
    • http://carluxepaint.site/250762661756pghi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478408/normal_5ff318cb2176c.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/ejbgjhf/pokemon_the_movie_detective_pikachu_download.pdfIn PDF document text
    • http://allwoman.site/20981287077je2vd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_602f345325a3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogivuwe.onlinewebshop.net/65577066020.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_off00013350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 5164 bytes
SHA-256: 1511ce35dac601a7ef7d272e2a0dd7da3ac8535ca430555328ce7275f9c5158e
font_01_sfnt_off000144c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C7 10792 bytes
SHA-256: c3ad2318edc1e0d9c9fe181e99175a008808662e51f8c1841816e663acb15311

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