Malicious PDF — malware analysis report

Static analysis result for SHA-256 f320d6d1b4cd3e25…

MALICIOUS

PDF

76.1 KB Created: 2021-03-10 23:53:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 98f8868c05aac66d040ec0bdda52e158 SHA-1: 55a80c52080ec724bb6dff3e50ca514234c5e119 SHA-256: f320d6d1b4cd3e251ad9d86bf71c1e7ac500eef92fde1522c78d975ab576aabb
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to disposable hosting or known malicious redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'dafemum.ru', indicating a malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=adding+linear+expressions+worksheet In PDF document text
    • https://nisikigibifug.weebly.com/uploads/1/3/0/8/130813528/d9768.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/wodarukoxepej-zofutogubava-rekulu-xurelitawa.pdfIn PDF document text
    • http://nizixoj.iblogger.org/fidizazo.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/following_directions_worksheet_third_gradewxonw.pdfIn PDF document text
    • https://tajamexuzoxobug.weebly.com/uploads/1/3/1/4/131410736/loxesuzere_guremineku_zepafimiletet_vusonesi.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/the_castle_kafka_analysis.pdfIn PDF document text
    • http://peskomment.ru/carrera_slot_car_troubleshootingbv01z.pdfIn PDF document text
    • https://vizedaxitexoter.weebly.com/uploads/1/3/4/7/134740617/wetevovagaluz.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/wahl_cordless_magic_clip_hair_clippers.pdfIn PDF document text
    • https://sosatiga.weebly.com/uploads/1/3/1/1/131164398/4805795.pdfIn PDF document text
    • http://pejokepi.mywebcommunity.org/waterpik_cordless_ultra_plus_water_flosser_wp-450e_-_blue_white.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koriwironawuva.myartsonline.com/carrefour_egypt_offers.pdfIn PDF document text
    • http://xofunuxemijowex.rf.gd/90974138101.pdfIn PDF document text
    • http://ruroratetibik.rf.gd/wesitixowarokemisenit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2913a5f3-2afc-4c21-9c68-9a957165212e/subway_surf_indir_hilesiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3db4d574-3f6c-44d0-89de-3f2f7bcfb731/because_i_could_not_stop_for_death_summary_shmoop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f905c6-cb60-40bd-ada4-941be53105a0/a_first_look_at_communication_theory_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e765fb1-fb17-4d03-a322-6045500846a5/hp_elitebook_folio_9470m_specifications_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7993e48-39d0-4045-ad09-9cb759e393b5/what_is_a_theme_of_the_lottery.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_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 5432 bytes
SHA-256: c22454e6689908c10f6dfc5f82c9946680463b4e048ec53820d831138295b6e9
font_01_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 10332 bytes
SHA-256: dc60869d3cf130822a5a8992f4710d55590f8b58c99e9089073afdc4292c8835