Malicious PDF — malware analysis report

Static analysis result for SHA-256 427cee38beefe7f1…

MALICIOUS

PDF

73.7 KB Created: 2021-04-08 08:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f22b58df5627e8efd6120d8278fc5013 SHA-1: 948abff05ae899ee847db5e8999e657e9e678491 SHA-256: 427cee38beefe7f1a2bdd9e0b2dc7e34cee57527e59e2b28372c8deb1a267efd
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

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://dugedepap.ru/strik?utm_term=chaos+theory+wine PDF link annotation
    • http://taher-tcac.com/67936450794xzro8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_5fd1212f453f6.pdfIn PDF document text
    • http://juponuziwotaga.mywebcommunity.org/geekvape_aegis_solo_manual.pdfIn PDF document text
    • http://visetazide.medianewsonline.com/dagadazi.pdfIn PDF document text
    • http://dreabling.online/mivituvonenipekejedbax7s.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/gelebefesalowi.pdfIn PDF document text
    • http://vclean-sale.shop/500840395287o7hd.pdfIn PDF document text
    • http://2020coupons.info/asus_xonar_d2_7.1_drivers1q87y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_6015d3db3a378.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/65516249922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_6065cd52a0602.pdfIn PDF document text
    • http://jeruwit.mygamesonline.org/coordinate_plane_notes.pdfIn PDF document text
    • http://dobuwiwitevotir.sportsontheweb.net/free_ebook_reader_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_5fd3cc4c2158d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471114/normal_60279601c8b2f.pdfIn PDF document text
    • http://woronari.getenjoyment.net/sda_church_hymnal_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485704/normal_60346bd139ae4.pdfIn PDF document text
    • http://4escam-bot.online/tijopirexebimazokutatodeprgn2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/yard_machine_snowblower_8hp_24_inch_parts.pdfIn PDF document text
    • http://fuxuxasezid.atwebpages.com/wubapefofafobipumejiluvi.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/xakojiraxulebije.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_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 4840 bytes
SHA-256: 8aba7fcd4a435986ccb01ead794e8696fd2853830cb36a707ec53c33767487e4
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 10808 bytes
SHA-256: ab7831c07e5fcd5a25c556825b8c66e3b6a871d013713b61112da8800665a5f7

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