Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc8b4321cb2154f…

MALICIOUS

PDF

77.0 KB Created: 2021-03-12 17:37:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b0364d955187b443e8bff332a14a3169 SHA-1: fed57e4768b787a335a5dbe9755b884bb2d47c29 SHA-256: cbc8b4321cb2154fb5f90ce43589764265a78e6f06b5bb1cffdb89b6eb64c0d9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'kuzutuzo.ru', which is likely used to host malicious content or phishing pages. The document body, though heavily obfuscated, suggests a lure related to real estate listings, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=conejo+creek+condominiums+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5fdc877130eb6.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/81428104219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393208/normal_603775b46b08d.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/jewipijak.pdfIn PDF document text
    • http://wogedebepodev.22web.org/galebiranasum.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/40024789453.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/savijafigup.pdfIn PDF document text
    • http://masewir.22web.org/jack_reacher_books_in_reading_order_uk.pdfIn PDF document text
    • http://dupamineni.medianewsonline.com/85244444595.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/how_to_use_ipod_touch_4th_generation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_6010f7680beea.pdfIn PDF document text
    • http://talemine.getenjoyment.net/68977584944.pdfIn PDF document text
    • http://sutiwejepeb.22web.org/kidney_transplantation_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484633/normal_604653c943de9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412774/normal_5fe312167e2bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c29b00d-10ad-41eb-9992-92c6f8cef666/vanaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b47e59-e221-4c25-9644-83db6d997135/what_does_blinking_blue_light_on_xfinity_box_mean.pdfIn PDF document text
    • http://godutiliwaganos.rf.gd/7344949378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebbfd719-935b-4a2c-8b71-66470f0ca1a5/scag_turf_tiger_61_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af86058-167b-4ff8-aee8-26fe46a5dd6d/tivuguvimiwa.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_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 5212 bytes
SHA-256: 6c77b8142a5656c011ab9e00c97c821e47ae9ffdd0b12d988fddebbb4c05825c
font_01_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 12944 bytes
SHA-256: 52a066d61fb3330a13c74da2918d3f64e937f3a1952c7d5bd9affe17687bdad6

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