Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5865ebfec03d6f…

MALICIOUS

PDF

77.8 KB Created: 2021-03-18 21:24:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ddd1d1b7ef193ee4f315895412f5c48f SHA-1: 586c80912957de3d58de0f03f17af7bb31ba30f0 SHA-256: 0a5865ebfec03d6f0fdfd500444d946a9474b7b8a60d9bea3df629c874caaab7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs disguised as document content, aiming to redirect users to potentially malicious websites. Heuristics indicate it's a link farm on disposable hosting, and ML/ClamAV detections confirm its malicious nature. The primary attack pattern involves luring users through deceptive content to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=engineering+mechanics+statics+and+dynamics+13th+edition+solutions+manual+pdf PDF link annotation
    • http://nituzovido.getenjoyment.net/is_the_2009_toyota_corolla_a_good_car.pdfIn PDF document text
    • http://vijofudevadotar.mywebcommunity.org/91332271033.pdfIn PDF document text
    • https://begagezegitajaj.weebly.com/uploads/1/3/1/3/131398046/5cf6d35965542af.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/honeywell_hcm-350_humidifier_for_sale.pdfIn PDF document text
    • https://takesefitetipal.weebly.com/uploads/1/3/2/6/132682925/c80392.pdfIn PDF document text
    • https://wepusetu.weebly.com/uploads/1/3/2/6/132695333/ripuse.pdfIn PDF document text
    • http://sosuziba.mypressonline.com/dish_network_address_to_mail_bill.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/cabala_judia_libro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_600b504843acd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5fe78a2d33cf9.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/QjfIhbj/9099130569.pdfIn PDF document text
    • https://dewofawofuzujo.weebly.com/uploads/1/3/0/7/130775987/113c9696e.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/sawawen.pdfIn PDF document text
    • http://pasadurasasagi.medianewsonline.com/penatalaksanaan_dermatitis_atopik.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/6hbgeSN/gumball_machine_line_drawing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370268/normal_5ffbd74e437f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodirinukamole.onlinewebshop.net/nudijima.pdfIn PDF document text
    • http://dirulibas.onlinewebshop.net/inequalities_test_review.pdfIn PDF document text
    • http://nodikaduf.onlinewebshop.net/asrock_z170_pro4s_price.pdfIn PDF document text
    • http://kipazafar.atwebpages.com/maytag_2000_series_washer_not_working.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_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 5844 bytes
SHA-256: fe9064e4299a51dae545f9a5b6375b6f76fd2b774326a77dd45e2c4651625662
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 11708 bytes
SHA-256: f21852c47f1cf70ac2e5bfbb7b548a9de11b5d31e793111cb61de512fb9a570d

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