Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ed7ad986af59b1…

MALICIOUS

PDF

79.5 KB Created: 2021-03-25 06:32:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 44217b67fa7647328a37732f17572984 SHA-1: 12e840cd90c10983fd4e25dc9b2a1c4460ea53e8 SHA-256: c5ed7ad986af59b18efc910a587279e2505f3ec9d06aad621236da01c19a5268
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, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/123?utm_term=journal+citation+report+2018+thomson+reuters PDF link annotation
    • http://acupofjacob.com/712453459069njey.pdfIn PDF document text
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/5042713.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/what_is_love_and_respect_quotes.pdfIn PDF document text
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/723bbef3cc.pdfIn PDF document text
    • http://tixanijematewe.mypressonline.com/13585290032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_60140b0e59298.pdfIn PDF document text
    • http://bizowokare.getenjoyment.net/rubululi.pdfIn PDF document text
    • http://mexicotop.xyz/t-maxx_2.5_vs_3.3_motor0ybrs.pdfIn PDF document text
    • http://konalofasu.mywebcommunity.org/temimizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494429/normal_602719654b32c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502906/normal_5ff05be4a7109.pdfIn PDF document text
    • http://biolinkus.me/bushnell_yardage_pro_500_owners_manual9bhxh.pdfIn PDF document text
    • http://slimerecipe.org/quantum_field_theory_and_the_standard_model_by_schwartz4ua0j.pdfIn PDF document text
    • http://kneeksi.ru/89348375494ls8a9.pdfIn PDF document text
    • http://good-production9.site/medical_laboratory_science_review_5thxfukk.pdfIn PDF document text
    • http://wamipivifubape.sportsontheweb.net/bukigenotutalivebuwe.pdfIn PDF document text
    • https://zegabanibo.weebly.com/uploads/1/3/5/3/135339571/3aecca3b.pdfIn PDF document text
    • http://gravkamen.ru/html_and_css_interview_questions_githubhem03.pdfIn PDF document text
    • http://weinmvc.net/certified_estimating_professional_study_guide95jdc.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/what_was_the_march_1917_revolution_about.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/grimorium_verum_the_true_grimoire.pdfIn PDF document text
    • https://losuwasujiro.weebly.com/uploads/1/3/1/6/131637226/6613547.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/29347346221.pdfIn PDF document text
    • http://bodyita.space/94151734874nimf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_6020b5e83ae50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 5684 bytes
SHA-256: 40f59034c7a898d2a60766b5e40d6d0b5d436f43a6ea1cfffb1972d8c813b4b2
font_01_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 11368 bytes
SHA-256: b325d368b4e569b7a33460efd9ff13375c778046928ce0c55e9293ce0f555eab

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