Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dde1ad0c04da211…

MALICIOUS

PDF

152.1 KB Created: 2021-03-14 23:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 543507203d76d67e0da082b96a13be12 SHA-1: 45cca08725cc46abbda72cfb657bf5059dfe365c SHA-256: 8dde1ad0c04da211de59097432335542638cf1838ec71a03fd3885547c069fab
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure to host many links on potentially untrusted or temporary hosting, reinforcing the phishing or malware distribution intent.

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://seumenha.ru/award?keyword=genetica+na+agropecuaria+livro+pdf PDF link annotation
    • https://jevavuxenexek.weebly.com/uploads/1/3/5/3/135351486/6212659.pdfIn PDF document text
    • http://puloxev.iblogger.org/kavefiputowovaxudilimimux.pdfIn PDF document text
    • https://foritedaxezakul.weebly.com/uploads/1/3/4/0/134016863/7033759.pdfIn PDF document text
    • http://zulurasovuguloz.66ghz.com/cuanto_es_un_metro_80_en_pies.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/what_are_the_different_types_of_automatic_transmission_fluid.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/hegitii/cute_unicorn_coloring_pages_book.pdfIn PDF document text
    • http://memisada.mygamesonline.org/cdc_bubble_sheet.pdfIn PDF document text
    • https://lajizifoposu.weebly.com/uploads/1/3/5/9/135958207/gorotetijujukaduz.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/dD2U4oH/bloons_tower_defense_6_free_download_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/iHhaahh/game_maker_free_online.pdfIn PDF document text
    • http://subejewumo.scienceontheweb.net/20865176621.pdfIn PDF document text
    • http://mozodulo.iblogger.org/luxufev.pdfIn PDF document text
    • https://xajomorunineg.weebly.com/uploads/1/3/1/3/131383441/6821611.pdfIn PDF document text
    • https://sugelazo.weebly.com/uploads/1/3/4/7/134767002/laxirikulirafedabuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://damikofem.rf.gd/calculating_magnification_worksheet_ks3.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/figat.pdfIn PDF document text
    • http://mifedisiso.atwebpages.com/charles_de_secondat_baron_de_montesquieu_the_spirit_of_the_laws.pdfIn PDF document text
    • http://gumizaxewa.atwebpages.com/ralph_waldo_emerson_self_reliance_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/47480410765.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/nefuru.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_off0002106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2106C 5236 bytes
SHA-256: 0bf5c8b13dc5b196b9e01e24ac379de5ba387ac7baa0ca6d9809e3e417733fe1
font_01_sfnt_off00022260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22260 16096 bytes
SHA-256: 4ad1aa407a74f4467cb0be421b6a6e29f58ba6e1dced46a638565ffa636bdd96

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