Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ff76b786b82b11…

MALICIOUS

PDF

79.2 KB Created: 2021-04-02 14:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d6381e5315df26ca2166c904c72c0429 SHA-1: f05175e364325194ed4d2d1e96e8621c63c96512 SHA-256: c9ff76b786b82b11db4a7b6d7a57c42d236690eaa77690478daf4a55b0e115eb
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The embedded URL `https://botokaw.ru/strik?utm_term=how+to+fix+tv+with+no+picture+but+has+sound` is particularly suspicious and likely leads to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=how+to+fix+tv+with+no+picture+but+has+sound PDF link annotation
    • https://xunowarusaki.weebly.com/uploads/1/3/4/3/134371630/xedudegasadil.pdfIn PDF document text
    • http://wunanufirum.22web.org/jukijomap.pdfIn PDF document text
    • http://larekew.mywebcommunity.org/essential_mathematics_for_economic_analysis_4th_edition_solutions.pdfIn PDF document text
    • http://gamedv.design/891522058297yvns.pdfIn PDF document text
    • http://gladkoe-telo.xyz/lorutoborufowuwa74r5p.pdfIn PDF document text
    • http://wisemad.22web.org/sabapuzumiz.pdfIn PDF document text
    • http://es50off.pro/how_to_pair_two_echo_dots_togetherjlq4h.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/what_is_a_primal_fear.pdfIn PDF document text
    • https://lututigit.weebly.com/uploads/1/3/5/3/135335707/9122272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_d6f699f9fdcf4cb2b81681bc268ab9a9.pdf?index=trueIn PDF document text
    • http://lumosaneja.onlinewebshop.net/blender_2._80.pdfIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_762e8cb6d0bf4831a39bb2f48c028e39.pdf?index=trueIn PDF document text
    • http://vuzitugu.epizy.com/xasamidixonopoja.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_5b0cd6c0e7484e55885863e641266e51.pdf?index=trueIn PDF document text
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_2234b5e78c6f4af7b56068d4c6125c43.pdf?index=trueIn PDF document text
    • http://datonojafasaxup.rf.gd/64368614464.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_42a16dcd89f64f509fe520f10ee74ed5.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_3bff39f98496448eb107522d0bc156d1.pdf?index=trueIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_3ab098a7fb004ff5921200ffb559ea53.pdf?index=trueIn PDF document text
    • http://rodoluvajepitu.rf.gd/hurtta_active_sele_strrelsesguide.pdfIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_c6134eec57e34b359a27cd73d8e0f805.pdf?index=trueIn 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_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 5532 bytes
SHA-256: a12de93a77317f32499bffbc24158141d791e06f409c6ead32811341cf7f2640
font_01_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 11024 bytes
SHA-256: 7a9bbbd74451b6d032f4d8d78da232a687e39c8043a87ac46188a2be002fdf9c