Malicious PDF — malware analysis report

Static analysis result for SHA-256 cccbdcb236970426…

MALICIOUS

PDF

88.1 KB Created: 2021-04-08 08:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4604633b1b935cd9b42a4d5fbbd8b780 SHA-1: b0626ee887203ff2e31343dabf3e184b53fd265c SHA-256: cccbdcb2369704269e7fb911b69fe1e0354f47934f6aaffe8fbf61641f6329d4
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=fzmovies.+net+bollywood+movies+free PDF link annotation
    • http://vubitim.sportsontheweb.net/basic_grammar_in_use_evaluation_test.pdfIn PDF document text
    • http://laulu-go.ru/5586765887eb6o.pdfIn PDF document text
    • http://vuroxinizona.scienceontheweb.net/craftsman_dyt_4000_reviews.pdfIn PDF document text
    • http://sakhavto.ru/65465280440fnf61.pdfIn PDF document text
    • http://flebolog24.com/wupepugoledkjyo7.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/energias_renovables_en_mexico_2020.pdfIn PDF document text
    • http://kodutizaga.mywebcommunity.org/88116482033.pdfIn PDF document text
    • http://tojumuwuluso.iblogger.org/bible_lds.pdfIn PDF document text
    • http://pigalimiru.medianewsonline.com/pezemupusura.pdfIn PDF document text
    • http://pagexonani.iblogger.org/kunomonujefisukufi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofukadebinomo.epizy.com/xolurewuzufopa.pdfIn PDF document text
    • http://fezesotufixodow.epizy.com/sample_construction_safety_incentive_programs.pdfIn PDF document text
    • http://sogakusepululir.epizy.com/82968298064.pdfIn PDF document text
    • http://jonesunomipavi.rf.gd/app_to_download_free_books.pdfIn PDF document text
    • http://lufevexos.atwebpages.com/lajovokudegidanuj.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_311cb9ba8cb6416185a7ca4da433fdc9.pdf?index=trueIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_d7be9e6c16a44555b1eb97ed3cf5d2ae.pdf?index=trueIn PDF document text
    • http://kodekexonalana.epizy.com/55047985138.pdfIn PDF document text
    • http://kijemuf.epizy.com/6315690160.pdfIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_8d7d7cea1e734cd7bbe78f758a1f490f.pdf?index=trueIn PDF document text
    • http://ginowane.onlinewebshop.net/gijabasaxit.pdfIn PDF document text
    • http://waxaravibew.epizy.com/1520557795.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 5276 bytes
SHA-256: 21b73e774ef8ea035f4211da869c6733b8d2be55615842fa9ca4ba40bce0defa
font_01_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 12204 bytes
SHA-256: bdae94ab8ffbc7b8d61c901fb0033170dbf9f89a7b21c065080133268c9f1107
font_02_sfnt_off00013c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C82 16340 bytes
SHA-256: 012d73fc88539e4518720b745ad0cc6f5bc81c57de74a770fec83dd9c892e216