Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9197a045eda258…

MALICIOUS

PDF

69.3 KB Created: 2021-04-24 00:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 83bf001ce4f8eccd70b8a42a2f8a33b8 SHA-1: ae0c708283f76a34a56c41d8ae8b677dbc595ac2 SHA-256: fb9197a045eda258b766cf90743bcf1abb1fab4a762b26e3b5a0d9cf69f75379
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=stern%2527s+introductory+plant+biology+14th+edition+pdf PDF link annotation
    • http://mojenisijita.mywebcommunity.org/xafajidunenisokoxezekumol.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/micGggi/breadwinner_definition_oxford.pdfIn PDF document text
    • https://cdn.sqhk.co/rinilafexowi/gdfge8l/3581742015.pdfIn PDF document text
    • http://nashremont.site/runinarixajifosikofagepev49b2n.pdfIn PDF document text
    • https://cdn.sqhk.co/kowalaxu/hhcKWhh/59940467023.pdfIn PDF document text
    • http://kibasemenatax.22web.org/taziwefiwifu.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/E7jcjhX/reroruwopusakiki.pdfIn PDF document text
    • https://cdn.sqhk.co/mojuzizimu/3pWjgjb/g_force_racing_suit_cleaning.pdfIn PDF document text
    • http://evilcheats.fun/pathfinder_2_monster_manualdbihb.pdfIn PDF document text
    • http://sokobumoxagug.scienceontheweb.net/princeton_review_mcat_science_workbook.pdfIn PDF document text
    • https://cdn.sqhk.co/gulijolane/RDZBNfy/fallout_4_minigun_damage_mod.pdfIn PDF document text
    • http://paxenazubenib.mygamesonline.org/6312565180.pdfIn PDF document text
    • http://uanews.website/voxoginovubi5utup.pdfIn PDF document text
    • http://trysol.xyz/70703768473bbzhh.pdfIn PDF document text
    • http://pe50off.info/financial_and_managerial_accounting_for_mbas_5th_edition_cheggh4crw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasebusezazov.rf.gd/jofofiviva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc1ee2a-a8d6-4b30-813b-ece2e0fbf835/how_to_learn_electrical_wiring.pdfIn PDF document text
    • http://lidudoxodirabi.rf.gd/mumibesubijowoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce08f97-df08-4a93-840b-3723c095a955/general_theory_of_relativity_dirac.pdfIn PDF document text
    • http://xulaxun.rf.gd/gewore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3c5fc7-5e99-4488-9e21-9e8e7a246fe4/figure_drawing_models_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ffbb74-bbfb-456c-b7bf-e5ed8e3c8b9f/online_payday_loans_cash_now.pdfIn PDF document text
    • http://nujivoforegiv.rf.gd/44012045276.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_off0000cf20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF20 5936 bytes
SHA-256: 1c539049c2abd93eaf5451ff522f5dcb55cb66a6cf90ae0a75782615ffa08ea0
font_01_sfnt_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 10184 bytes
SHA-256: a4bae43eb40dd27dc39f0ed8c137f2861ab1d3349bf0682e3e04a3e019012b73

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