Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8802dc79ce2435…

MALICIOUS

PDF

77.8 KB Created: 2021-04-23 01:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4753301f376affde3b08ae0cec14e0b1 SHA-1: e4799e74a90c2efb707f6aaf7b6f30a3252bc78f SHA-256: fb8802dc79ce2435bed1d3578c99bd90137f4e84cf61ffa3ab599c60b516a844
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 of which point to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to a '2014 toyota camry maintenance guide', indicating a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=2014+toyota+camry+maintenance+guide PDF link annotation
    • http://lirinevewafa.mypressonline.com/cambridge_english_pet_book.pdfIn PDF document text
    • http://mejuzemirefewuk.iblogger.org/byomkesh_bakshi_comics_free_download.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/kunatowegimiraro.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/sikonutosenugesenadi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5fcbe4891cb46.pdfIn PDF document text
    • http://xogabimodefage.iblogger.org/jopelogemilawin.pdfIn PDF document text
    • http://zereteleriw.getenjoyment.net/85901573916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_601d24a7c3b8e.pdfIn PDF document text
    • http://palogaza.sportsontheweb.net/english_speaking_important_words.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_604d262225c29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_6032235fcf687.pdfIn PDF document text
    • http://bexemusu.mypressonline.com/advanced_filter_in_excel_2020_with_example.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zogadawedalifap.onlinewebshop.net/circulatory_shock_2020.pdfIn PDF document text
    • http://lafagelupuf.myartsonline.com/67695152490.pdfIn PDF document text
    • http://duzuxaxuba.epizy.com/good_sat_books_2020.pdfIn PDF document text
    • http://kukejisagev.epizy.com/arrhythmia_treatment_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdb8d68d-5ce9-4b74-9202-cfd3fd016206/sportspower_14_trampoline_assembly_instructions.pdfIn PDF document text
    • http://lajimaju.epizy.com/noxofevuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d05edc50-8350-4ec8-bc27-c3166c512ade/york_furnace_wont_light.pdfIn PDF document text
    • http://jobisazukom.rf.gd/irobot_braava_jet_245_reusable_pads.pdfIn PDF document text
    • http://wazuvolixevafo.rf.gd/ciencias_formales_relacion_con_la_vida_cotidiana.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_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 5472 bytes
SHA-256: 6f9c3b8ea7d874335861864db32a17df35f3826c74a7a796bedbe4f2cb845609
font_01_sfnt_off0001058a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058A 10780 bytes
SHA-256: 23a7fcd6a890c26d14c3963f986e3fac4570b904a47e0091ab5aa4685667e9a4

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