Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4a79b58428124a…

MALICIOUS

PDF

89.0 KB Created: 2021-04-14 08:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ad692740280d88051ab9a856598fa5ca SHA-1: 25aaeec5f59dcf1b59100fc4deaea71cc99ce8be SHA-256: 7d4a79b58428124ae43f452fd1200ae5dafd518a94ff02259a03ea7a57efb931
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=which+graphic+design+software+is+best PDF link annotation
    • http://lotto-investclub.com/cardiotocography_interpretationl3e58.pdfIn PDF document text
    • http://datiwufirul.medianewsonline.com/anemia_de_celulas_falciformes_en_pediatria.pdfIn PDF document text
    • http://puduvab.sportsontheweb.net/barcelo_maya_palace_map.pdfIn PDF document text
    • http://ig-soft-team.com/wurigetiwibesema5q0gr.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/inter_1st_year_commerce_book.pdfIn PDF document text
    • http://begetus11ppz.xyz/jezekimincccly.pdfIn PDF document text
    • http://comp-arenda.site/how_to_use_sanitas_blood_pressure_monitor2y0im.pdfIn PDF document text
    • http://nitiwomifigurod.mygamesonline.org/thinking_with_type_ellen_lupton_download.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/list_of_old_sanyo_tv_models.pdfIn PDF document text
    • http://itasda.online/bujuxepunopazubowosozfwz33.pdfIn PDF document text
    • http://cosmeteca.com/how_many_pages_in_keeper_of_the_lost_cities_nightfallomhtn.pdfIn PDF document text
    • http://viteroludobano.mypressonline.com/gasajive.pdfIn PDF document text
    • https://drodil.kapsi.fiWhenIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvotawelotito.epizy.com/41209589726.pdfIn PDF document text
    • http://tujiritam.epizy.com/pibatonilizi.pdfIn PDF document text
    • http://xiwozoget.atwebpages.com/50917615341.pdfIn PDF document text
    • http://belibivizonojo.myartsonline.com/34799307713.pdfIn PDF document text
    • http://juwukopegonamu.onlinewebshop.net/bilingualism_vs_multilingualism.pdfIn PDF document text
    • http://tosawivigibi.rf.gd/how_to_tell_the_weight_of_oil_work.pdfIn PDF document text
    • http://mipaduverututus.rf.gd/digital_photography_online_training_course_with_certificate.pdfIn PDF document text
    • http://jadivepijuga.myartsonline.com/good_books_to_read_in_english.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_off00011ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 5628 bytes
SHA-256: 372e553f2779c3e48debaeee74e5b092f664d8a62f6f5758694002766ea73a9b
font_01_sfnt_off00013206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13206 10892 bytes
SHA-256: e69fec9a2b465821a713977f62358a96bb1bfc83fff68654f23aacdcd9ebe6f9

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