Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc726dd8e6bb09e9…

MALICIOUS

PDF

82.4 KB Created: 2021-03-26 05:33:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ba59ebfd6914f61b8621779fb38bcfd5 SHA-1: d0206a181f29f47ae5b3694c5c2be7307e463463 SHA-256: bc726dd8e6bb09e918744309f21305fa28d57775b3d9fa3c4e5830e163657fdc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary one pointing to 'https://nipisod.ru/strik', suggesting it's designed to redirect users to a potentially harmful site. The PDF's structure and embedded links indicate it functions as a link farm, likely for phishing or distributing further malware.

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://nipisod.ru/strik?utm_term=panasonic+bq+cc17+solid+green+light PDF link annotation
    • https://cdn.sqhk.co/tawunipufop/ioheYhg/crushed_ice_cube_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/bhcwb1y/wusejumoz.pdfIn PDF document text
    • http://kimokabif.medianewsonline.com/1784985189.pdfIn PDF document text
    • http://pimebujeben.66ghz.com/fezuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/nonebizi/Kw6Fjh3/nozejane.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/administracion_de_recursos_humanos_idalberto_chiavenato_libro.pdfIn PDF document text
    • http://kopumiwabetare.66ghz.com/l._i._c_assistant_answer_key_2019.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/19870566390.pdfIn PDF document text
    • http://zanapipok.getenjoyment.net/moxuberivikef.pdfIn PDF document text
    • http://pukawezo.iblogger.org/98260781026.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_07d127dc564943489acb021cc5126348.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae3f160-c150-4c1a-8bed-d83cd296693e/how_to_connect_echo_dot_2nd_gen_to_wifi.pdfIn PDF document text
    • http://vawelinixafapi.epizy.com/34794960471.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_4f80c5e3ea684a2fab8b62ee166330a6.pdf?index=trueIn PDF document text
    • http://bosagiriwamokin.onlinewebshop.net/fexofawof.pdfIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_d340f7ae7c6043ab9a1a950671e23164.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b116369-8bd4-4619-aa02-cda5f74f031e/sifapiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0181b7d-a32f-4b6b-ae3b-3f4bc8186a4c/23831012035.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_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 5600 bytes
SHA-256: a554d7789dee58b88a54eb682071443682b2fab0a78c5a3d1b9393f53cb75345
font_01_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 11880 bytes
SHA-256: d00202e8c63497dce39f9728230a604e17d3466c75cc6b0553360c06a1f1ceb2

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