Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aaeac389523fab0…

MALICIOUS

PDF

65.0 KB Created: 2021-03-22 06:28:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cf072686f1a4d0e7c8bebd92dcdea44d SHA-1: 80ae6c6b5d1810e64f68a6bb582302a437c17592 SHA-256: 5aaeac389523fab02298625cea2a5378f7b3f51fbfb6915a2fc3871d0995f50d
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 external links, many pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious 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://soxebez.ru/wix?keyword=climateright+by+cuddl+duds+thermal+set PDF link annotation
    • https://wikoxunorature.weebly.com/uploads/1/3/5/9/135968981/28015499.pdfIn PDF document text
    • http://bevubupowin.22web.org/metuburimu.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/o0heji6/nintendo_switch_color_changing_controller.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424029/normal_600a90512105a.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/lihgiYJ/ziwurobiku.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/how_to_read_pmbok_6th_edition.pdfIn PDF document text
    • http://gafabotipunofu.mywebcommunity.org/kedaver.pdfIn PDF document text
    • https://cdn.sqhk.co/xepiriza/0fgjgie/army_car_driver_mod_apk_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487005/normal_60301532e362b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388827/normal_6033e5a3ab762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_6047d3d2be062.pdfIn PDF document text
    • https://dokebama.weebly.com/uploads/1/3/2/6/132681336/rejovinejazinaj_pufifojot.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/31186330242.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifimerin.onlinewebshop.net/dopamine_agonist_parkinson.pdfIn PDF document text
    • http://sulaloweg.epizy.com/atari_flashback_mini_7800_review.pdfIn PDF document text
    • http://juborekif.atwebpages.com/hindu_predictive_astrology_b_v_raman.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_off0000c11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11B 5500 bytes
SHA-256: 419ba44d4a8f6c9232b41516d705a95ef03610f758bc6d50b045efe5c6764b59
font_01_sfnt_off0000d39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39F 10348 bytes
SHA-256: 91339305fa3439c6b8479d24d5c2398714df7a8eddabfd8928108d391627487b

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