Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8f77acf241625f…

MALICIOUS

PDF

74.8 KB Created: 2021-03-22 00:04:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cce029523603a1c153acb38a02f2339b SHA-1: e9b1e769313930e30ea5678beb5d103453ea3cd7 SHA-256: ed8f77acf241625ffa6eab6d13e13ed26ffa6b8b8041e60add2348adfe1440ab
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 document body, though heavily obfuscated, contains text related to 'Annona reticulata medicinal uses pdf' and metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. Numerous external URLs are embedded, with several pointing to disposable hosting and link farms, strongly suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=annona+reticulata+medicinal+uses+pdf PDF link annotation
    • https://fepafevadaxajaw.weebly.com/uploads/1/3/4/0/134095897/pelenilunajaxox.pdfIn PDF document text
    • https://robidolaw.weebly.com/uploads/1/3/0/7/130776002/7449907.pdfIn PDF document text
    • http://in-step.shop/1454242603rd04n.pdfIn PDF document text
    • http://davebamonuzove.medianewsonline.com/shakespeare_the_sonnets.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/adverse_drug_reaction_types.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/jabugunefemosut.pdfIn PDF document text
    • http://shopsmmv.site/vocabulary_workshop_level_c_unit_2_answers_vocabulary_in_context16abx.pdfIn PDF document text
    • https://rasasagodum.weebly.com/uploads/1/3/2/3/132303335/mimuretefotobega.pdfIn PDF document text
    • https://tozupolut.weebly.com/uploads/1/3/0/9/130969077/10084e.pdfIn PDF document text
    • http://strapslap.online/chandramukhi_movie_full_hdg4wud.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/nasb_thompson_chain_reference_bible_large_print.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/zategafozasiru/26238356760.pdfIn PDF document text
    • http://repofifimi.epizy.com/nafame.pdfIn PDF document text
    • http://bedopevidorofi.myartsonline.com/zererub.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/indian_flag_images_for_whatsapp_dp.pdfIn PDF document text
    • http://zupitatip.atwebpages.com/xifokokevetamiguvezofuw.pdfIn PDF document text
    • http://buxodanukesidup.epizy.com/16987826383.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/60711276767.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_off0000e368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 5288 bytes
SHA-256: a9302f3f5d808aed20375bc6af6c1e9789ea9a17a586d62bae187cc6c0e4d775
font_01_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 11860 bytes
SHA-256: 7a66e836e09ab737ff4b09a5ad9df7d492893b3cdc6b199d9f8996048c67d442

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