Malicious PDF — malware analysis report

Static analysis result for SHA-256 c554a288b2fb3122…

MALICIOUS

PDF

86.7 KB Created: 2021-03-06 07:35:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1881929dc1367d1cc549582ae48956f8 SHA-1: d59504d9aa6b8e6f494c0356ab7cd7ceb1eef0d1 SHA-256: c554a288b2fb3122a89807ef1a029cbdbbf01c1e220467cd2b3e4b5ee6f5bbe7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to distribute malicious content. No scripts were extracted, but the presence of numerous external URLs is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://lozipotod.ru/aws?utm_term=bolt+action+vs+semi+automatic+sniper+rifle
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/c72438d4dc668.pdf
    • http://tedurelaseji.mygamesonline.org/dogubapeji.pdf
    • https://fileduwefevara.weebly.com/uploads/1/3/4/3/134384607/59632307d442fb.pdf
    • https://polupamenutotuk.weebly.com/uploads/1/3/5/3/135334754/mulakezasirujevita.pdf
    • https://pejoguroboxifuj.weebly.com/uploads/1/3/1/6/131637830/vogod.pdf
    • https://pofuzopabo.weebly.com/uploads/1/3/4/3/134307265/kofumu.pdf
    • http://tavafotuzefox.sportsontheweb.net/jeruxopo.pdf
    • https://metekazup.weebly.com/uploads/1/3/2/8/132815755/c5ad00.pdf
    • http://lijonotogi.scienceontheweb.net/pisegurufupozipinisivo.pdf
    • https://nokavapeselodes.weebly.com/uploads/1/3/4/6/134638024/nubudavejulex-voninomukiz-tebajisokugafo.pdf
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/5720464.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jaloto/74091724003.pdf
    • http://rizivubonulej.atwebpages.com/senior_digital_designer_salary_london.pdf
    • https://uploads.strikinglycdn.com/files/e4409b44-9dc4-4e20-9b6d-3057ea09a65c/35838906139.pdf
    • https://s3.amazonaws.com/zetituri/unisa_online_application_form_for_2020.pdf
    • http://bifovigavij.myartsonline.com/6128038343.pdf
    • https://uploads.strikinglycdn.com/files/fd33b43a-4b61-4f7f-8891-e694285dc6cd/67008488687.pdf
    • https://uploads.strikinglycdn.com/files/ec446a88-ae22-486c-89fe-43ecec572078/myra_breckinridge_full_movie_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011504.bin
8c58df1774ccad5e8e23b0fd4dc1c739d2001da8379c82746d41706cddaf49d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11504 5268 bytes
font_01_sfnt_off000126e5.bin
ea0e2a7d59e77d6367509dd8c7d48dd717f9543b443dbc0d2e20e657b953ee44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126E5 11524 bytes

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