Malicious PDF — malware analysis report

Static analysis result for SHA-256 c325381665405d4f…

MALICIOUS

PDF

116.2 KB Created: 2021-03-15 15:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 65d2a61c6b99483d445a1b39f8011464 SHA-1: dff3f32ce64ecd9ab04a4affc2e11ae05a96b9b0 SHA-256: c325381665405d4f3971e4b99a16c8cf1bcd47c420e309428f07f39210481502
192 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a TV guide, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/wix?keyword=time+warner+el+paso+tv+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_5fdb765d275f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457008/normal_600bf7bb8bdcf.pdfIn PDF document text
    • http://sokavosutab.22web.org/is_bosch_the_best_dishwasher.pdfIn PDF document text
    • http://gatofupimekow.mywebcommunity.org/gawewiluzivemulibekedajoz.pdfIn PDF document text
    • http://detobusukited.iblogger.org/luzojur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_6040579b36375.pdfIn PDF document text
    • http://ligexekena.mywebcommunity.org/why_doesnt_my_nespresso_frother_work.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455179/normal_5ff508160ae7c.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/ezihwhe/zombie_party_decorations_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/jyhjjgx/rukotak.pdfIn PDF document text
    • http://misujupino.getenjoyment.net/multiple_choice_questions_on_data_communication_and_computer_networks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sizosuxexe.epizy.com/are_coroners_reports_public_record.pdfIn PDF document text
    • http://dawutanarav.epizy.com/happy_birthday_wishes_photo_free.pdfIn PDF document text
    • http://mukowepefirufeg.epizy.com/83789183655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19b075fc-a37d-4ad6-bb86-aec3c6c3042a/dewalt_dw744_type_2_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a82e8d-530e-42ff-b139-1467b9efd4c0/patton_electric_heater_recall.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/top_productivity_apps_for_android_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b31e35d-7cd9-4943-ad7d-2e8a33322ccb/tarenesawakifotapupefar.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/what_is_google_docs_templates.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_off00018a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A9A 5380 bytes
SHA-256: 4fcac88d202ba4a9d0b6f877080e745eca9af0e0902090403a1d0197a720da4d
font_01_sfnt_off00019ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CE2 11468 bytes
SHA-256: aed58525e610e73008ccc05d2803e0b343a57235f8bd9281d7bcc3c9f17b586f

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