Malicious PDF — malware analysis report

Static analysis result for SHA-256 c041d38d61c0a932…

MALICIOUS

PDF

75.8 KB Created: 2021-01-22 13:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 91d0fa34c2367b561ac4e74304c51336 SHA-1: c723d1314ba78bd0d8ebfef2bca0918756197d82 SHA-256: c041d38d61c0a9323fd8d1106658af4f9cc20eba502da75cf8a3c4f6af78c73a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. The presence of external URIs and the 'disposable hosting' heuristic strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/123?utm_term=influencer+the+power+to+change+anything+2008 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488346/normal_5ffb89e512e01.pdfIn PDF document text
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/5659c2fa132.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421215/normal_5ff78784c89e7.pdfIn PDF document text
    • https://cdn.sqhk.co/muzorefu/ilgggcj/giant_ants_movie_1977.pdfIn PDF document text
    • http://sukujemegamog.22web.org/51461021596.pdfIn PDF document text
    • https://cdn.sqhk.co/firumefetev/fgiL4jd/zidotajefamabimogi.pdfIn PDF document text
    • https://site-1178280.mozfiles.com/files/1178280/blogs_de_libros_para_descargar_gratis.pdfIn PDF document text
    • https://site-1192422.mozfiles.com/files/1192422/duolingo_learn_languages_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369794/normal_5ffed0bc78838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458623/normal_5fdab472cca12.pdfIn PDF document text
    • https://fefojaza.weebly.com/uploads/1/3/4/4/134480993/ramewogoromemi.pdfIn PDF document text
    • https://duxotitur.weebly.com/uploads/1/3/4/5/134596147/2cdbe4d5fa26.pdfIn PDF document text
    • https://site-1226658.mozfiles.com/files/1226658/mopavanuvosilirudutalog.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/favibaki_xuwazewuwa_takixipimi_fobapobub.pdfIn PDF document text
    • https://cdn.sqhk.co/bimepefav/Jibiaid/free_country_music_ringtones_for_iphone_11.pdfIn PDF document text
    • https://site-1247675.mozfiles.com/files/1247675/chitralahari_telugu_video_songs_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383918/normal_5fdf2a8a88340.pdfIn PDF document text
    • https://site-1254516.mozfiles.com/files/1254516/boom_beach_mod_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nawupewiviziwik.rf.gd/ritotoroxujifi.pdfIn PDF document text
    • http://riwexakax.epizy.com/bihar_b._ed_application_form_date.pdfIn PDF document text
    • http://lugaderova.epizy.com/discussion_paper_template.pdfIn PDF document text
    • http://juxudawalugevop.epizy.com/xuloleforijokej.pdfIn PDF document text
    • http://mudozegiviw.epizy.com/37803991752.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_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 5696 bytes
SHA-256: 5c8c98696c691f310a070df5332dd6261645d679096cb74c3ea54d01ea23c027
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 10572 bytes
SHA-256: ffa0933ee84f194d18d105cf83d0fc4d919d9fb87a32c0358259a50681e79c2c

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