Malicious PDF — malware analysis report

Static analysis result for SHA-256 623debfa40e8fdc9…

MALICIOUS

PDF

87.3 KB Created: 2021-03-26 08:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a02775094458a3ad0a83bcc49321ae7c SHA-1: dd8d8e638625e43bb2e8da58573405e00b5e2c36 SHA-256: 623debfa40e8fdc97b28b864848b5f9ecfdde8a5fa0d459f743239b52536b84e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on various domains, likely to deceive users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=rebelion+en+la+granja+resumen+por+capitulos+pdf PDF link annotation
    • http://vorecan.fun/fezuwinofebimilimigesixausuis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485826/normal_605a8d8b172ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419194/normal_5fe0cf281461c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_60401bc15af14.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/45777341645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451035/normal_60351a28cc00e.pdfIn PDF document text
    • http://good-production20.site/galaxy_bowling_center_richmond_ky28tty.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://viledif.epizy.com/is_high_blood_pressure_dangerous_during_pregnancy.pdfIn PDF document text
    • http://rogofijanititad.epizy.com/tik_tok_google_play_store.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/30785450488.pdfIn PDF document text
    • http://roxudafemif.epizy.com/traveling_website_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/bichagadu_naa_songs_please.pdfIn PDF document text
    • http://sulojigemijat.rf.gd/altered_carbon_season_2_release_date_india.pdfIn PDF document text
    • http://fopebuzab.epizy.com/pexoxasedosatimak.pdfIn PDF document text
    • http://jurizamumi.myartsonline.com/at_t_u_verse_guide.pdfIn PDF document text
    • http://wetoxisifogif.epizy.com/atf_box_setup_v11._60_free.pdfIn PDF document text
    • http://xakireponamo.rf.gd/application_of_annotation_in_bioinformatics.pdfIn PDF document text
    • http://dijawazuk.rf.gd/besharam_movie_mp4_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/possessive_noun_worksheet_grade_2.pdfIn PDF document text
    • http://zuronixo.rf.gd/antariksham_songs_telugu.pdfIn PDF document text
    • http://sisufovofow.atwebpages.com/5654574307.pdfIn PDF document text
    • http://nopobakuso.epizy.com/mckay_building_construction_volume_2_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 5580 bytes
SHA-256: 991c6e69b9d3409b29f23c4b611a84e3201767428f6bd39825f68af1884fe46f
font_01_sfnt_off00011a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 11384 bytes
SHA-256: e31727fd876d2f7f42fdf6e635d3a561eaeabffb531b94c31a6222508073b4fa
font_02_sfnt_off00013f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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