Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b5ef94033581cd…

MALICIOUS

PDF

76.8 KB Created: 2021-04-02 23:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 065bc39fba459fa307fb2a7bffab807c SHA-1: 611f285f98b8de6e2125c04bf7b5f395f8889ee1 SHA-256: f3b5ef94033581cd8605fc197eab472ff53564dc220ee8f4613e3370a6988984
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains like weebly.com, suggesting a link farm designed to redirect users to malicious sites. The primary lure appears to be related to printer reviews, with one embedded URL specifically mentioning 'cnet printer reviews all one'. No scripts were extracted, but the extensive link farm points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=cnet+printer+reviews+all+one PDF link annotation
    • https://vidapuromojesa.weebly.com/uploads/1/3/4/8/134890941/9598863.pdfIn PDF document text
    • https://mamifamutimas.weebly.com/uploads/1/3/1/8/131871874/4527683.pdfIn PDF document text
    • https://vulefinan.weebly.com/uploads/1/3/2/6/132695887/buzamizibowal_fosijufeju_jitevosuli.pdfIn PDF document text
    • https://guravigipide.weebly.com/uploads/1/3/2/8/132815190/mojusin-rogumave-wizazun-fulavegapuxu.pdfIn PDF document text
    • https://didegesub.weebly.com/uploads/1/3/2/6/132681352/b7ba5ba58b44.pdfIn PDF document text
    • https://fejaxipanegis.weebly.com/uploads/1/3/2/7/132712099/segimovemipova.pdfIn PDF document text
    • https://bisuduroj.weebly.com/uploads/1/3/4/7/134714880/3d637c66fa.pdfIn PDF document text
    • https://varovugunigode.weebly.com/uploads/1/3/4/4/134480676/tikezaronusixed_kidozowo.pdfIn PDF document text
    • https://kedepojab.weebly.com/uploads/1/3/0/7/130739947/lababe_xilibodeven_lalikaxenelitow_sexosalatos.pdfIn PDF document text
    • https://fezabukife.weebly.com/uploads/1/3/5/3/135345753/8045550.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/4357940.pdfIn PDF document text
    • https://dovoviwum.weebly.com/uploads/1/3/0/7/130776035/856752.pdfIn PDF document text
    • https://lebotisoko.weebly.com/uploads/1/3/4/5/134597635/salokokifezamasik.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/wolodonelizonixezoz.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/df2a3ee8-446c-44f1-94be-433bed1fdd38/motorola_apx_6000_manual.pdfIn PDF document text
    • http://kilirafesiva.epizy.com/1585951258.pdfIn PDF document text
    • http://rulenanevatetid.epizy.com/blacksmith_leve_guide_ffxiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f14979-7212-4533-b369-d110efdecdf8/slaa_step_7_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c0db50-74b6-444c-bb7e-a425ec96f09f/vuwofaloximiridotoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380e8679-c477-4f46-bcb8-061697a8397d/pujawadoteri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4626d28c-c970-4fc9-b643-687c09b38093/zojipulixawofatuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/394e0d79-7ef2-44fe-83e9-27ec402923d8/software_development_methodologies_stages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2333319b-89f9-42b9-ae0c-954c91df7cd9/bash_scripting_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14cf31fa-883a-40ba-a945-ca3f1ea7e877/76121946954.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_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 4872 bytes
SHA-256: da1dfe980ce9f796e008b3162421c4172e682b7f3dcbb769de320a1a0dd3758d
font_01_sfnt_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 11684 bytes
SHA-256: a492f9da4f0d06fcc25a67102de9af29aa93fc6c5adbb7e0f0d5b53dbd4796e3

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