Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c489a98fc7ce592…

MALICIOUS

PDF

76.6 KB Created: 2021-04-08 00:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2fe11932a0ee1b57048bd7915a06a7ae SHA-1: d5d0e45333f901a3bc68c92692c4366cde626075 SHA-256: 4c489a98fc7ce592d7170c89710675e5ec34d549dc9eb15780e4f052ee3bfacf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, with at least one pointing to a suspicious domain that acts as a redirector. The presence of external URIs and the nature of the detection suggest this PDF is designed to lure users to malicious sites.

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://druttle.ru/strik?utm_term=wilma+unlimited+text PDF link annotation
    • https://pelozaxuji.weebly.com/uploads/1/3/2/6/132680784/kedetisu.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/bajar_musica_gratis_mp3xd_para_celular.pdfIn PDF document text
    • https://gelekale.weebly.com/uploads/1/3/4/2/134266195/zukavasenosuv.pdfIn PDF document text
    • https://zelejipez.weebly.com/uploads/1/3/4/3/134353750/556398.pdfIn PDF document text
    • https://teroradibiz.weebly.com/uploads/1/3/4/6/134652159/5551491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_603f8ecf41aa1.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/m_loeve_probability_theory.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463010/normal_606a052a303db.pdfIn PDF document text
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/fbfe21e8562f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://natidifober.epizy.com/what_are_the_objectives_of_audit_risk_assessment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/915c52ee-8a94-4ceb-b934-c2e3e5dddfbe/how_to_print_entire_dataframe_in_python.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5407b743-b327-486e-b9b1-fd8644c68de2/dowosabotaletuxiwe.pdfIn PDF document text
    • http://lununobasafino.rf.gd/hp_laserjet_1020_plus_printer_driver_for_ubuntu_18.04.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/097d3028-ed43-4586-bf32-0636a426441c/64071476344.pdfIn PDF document text
    • http://nosijatigatu.epizy.com/wavorizinewarozojipimebix.pdfIn PDF document text
    • http://jamadex.epizy.com/what_holographic_pokemon_cards_are_worth_money.pdfIn PDF document text
    • http://najexenij.onlinewebshop.net/ielts_grammar_for_writing_and_speaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ccbfb5-e8ba-4863-90c6-b8e0b2184bd9/gugom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 4548 bytes
SHA-256: 4accdb9e13cfce25bea5e27cd4102a61d504425ff1dc0335f7f119a5d041f287
font_01_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 11228 bytes
SHA-256: 2c650dd4e356c615b22278d44887f0cda1df2bb6dcdc078524c4d68909befdce
font_02_sfnt_off00011792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11792 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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