Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7d71cb942d25b8…

MALICIOUS

PDF

81.0 KB Created: 2021-04-26 14:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f80e1f3fdb70264652922e4a1d03ae1f SHA-1: bf6a4762a95e41cacf76c26e6bcd3294357cf666 SHA-256: eb7d71cb942d25b895289af574ab6be5575669fcdd41a191d26871543a962db7
126 Risk Score

Malware Insights

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

The PDF document contains a misleading title related to a popular movie series, intended to trick users into clicking external links. It leverages multiple disposable domains and link farms, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=in+what+order+should+i+watch+the+lord+of+the+rings+movies
    • http://xusetifawog.mypressonline.com/zilukatebutotanijaxunazo.pdf
    • https://vonasadan.weebly.com/uploads/1/3/3/9/133986887/8741935.pdf
    • https://pexesalakodosok.weebly.com/uploads/1/3/4/6/134650812/1051169.pdf
    • https://wadikojororewu.weebly.com/uploads/1/3/1/3/131398286/7b8b5fb2be326d.pdf
    • http://janorewaxeno.mygamesonline.org/shark_rotator_lift_away.pdf
    • https://duxuremi.weebly.com/uploads/1/3/4/6/134623812/6723749.pdf
    • http://napodosawukezob.getenjoyment.net/nusisewivipokok.pdf
    • http://kutejovanog.getenjoyment.net/aluminium_doors_and_windows_manufacturing_process.pdf
    • https://werudugin.weebly.com/uploads/1/3/0/8/130873895/wijosanemefosejuz.pdf
    • http://gadatoreneperil.mygamesonline.org/english_grammar_book_in_hindi_app.pdf
    • https://pimalikatirowo.weebly.com/uploads/1/3/4/0/134040386/digovi_kofas_letuninifu.pdf
    • http://kumajamefe.getenjoyment.net/faxopozuvubile.pdf
    • http://xopaberowiwin.getenjoyment.net/calculus_8th_edition_answers.pdf
    • http://rofuxipof.mywebcommunity.org/bratz_logo.pdf
    • http://vipadobotisituz.mygamesonline.org/what_does_dreams_are_the_language_of_god_mean.pdf
    • https://xevekarisugi.weebly.com/uploads/1/3/4/6/134697334/xusawik-beraloma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/34ab464c-4aff-4f83-ab25-683ad9730880/9160851993.pdf
    • http://najijojovigom.myartsonline.com/market_leader_advanced_business_english.pdf
    • https://uploads.strikinglycdn.com/files/f59547ce-8450-4068-82d9-4c20ade6fd90/sarutidosavajosari.pdf
    • https://uploads.strikinglycdn.com/files/7764e59d-7be8-4e4e-8138-dde76ec21a1a/damokatubupik.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000face.bin
53742b98fa79f1d80e50d568bff9b91f472f20014dfcc9657321c7e7984f5303		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 5524 bytes
font_01_sfnt_off00010d89.bin
699bfacf2ea5d4088b26157928215ec416fe03e3950cb9fc6bd54f0bdaee794f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 11444 bytes

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