Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10104ae7a33d560…

MALICIOUS

PDF

72.5 KB Created: 2021-02-14 07:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f315a10daf5e71bac072801bcb08475d SHA-1: c4f782299f06b99ef48c0aefa673d9297f81fa4c SHA-256: b10104ae7a33d5604143c8b5aa79396498ddbab58da290c4b343a6a97f55953b
66 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers as malicious. It contains numerous embedded URIs, many pointing to disposable domains and employing UTM parameters, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a lure for malicious content. No scripts were extracted, but the presence of many suspicious URLs points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/123?utm_term=pecatonica+high+school+wi PDF link annotation
    • http://bazis-rostov.com/31087038654axlgs.pdfIn PDF document text
    • http://segway-wheelchair.ru/cookie_sheet_with_cooling_rackimino.pdfIn PDF document text
    • http://mignonette.space/connectives_worksheet_year_2k3j35.pdfIn PDF document text
    • https://cdn.sqhk.co/buzunonoj/yjfasgh/resident_evil_degeneration_movie_flix.pdfIn PDF document text
    • http://naturapple.space/logic_puzzles_for_middle_school_printable_freemjoaa.pdfIn PDF document text
    • http://all-system7.club/bikini_body_guide_week_2_day_1wsdfj.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/gdhdjcI/citrus_tree_leaves_turning_yellow_and_falling_off.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxazazul/h3Whjic/zadevedututila.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/fgfmC9O/oxenfree_game_pass_quest.pdfIn PDF document text
    • https://cdn.sqhk.co/wotezowedo/0GhdyTj/suboxumekubunun.pdfIn PDF document text
    • http://sanadewa.iblogger.org/clancy_s_fish_pub_fremantle_gig_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/chjNzih/38834093619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jonora/momufejuxozewon.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/japan_travel_guide_itinerary.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/yerevan_tour_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/castlevania_2_game_guide.pdfIn PDF document text
    • http://laboluvimaniraf.epizy.com/ap_calculus_bc_frq_2008_form_b.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/gotulaganafovaweja.pdfIn PDF document text
    • http://repofifimi.epizy.com/swot_analysis_report_of_a_company.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_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 5056 bytes
SHA-256: a1c2aedc378e6da5c4c6ddcac6409d15af424ff3d28ea5940ace906f046e12b9
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 10676 bytes
SHA-256: ec8c558c79e9d5a6514c216cd1cdfc48dc6913f05d9e2055a8c20a68804889cb

Open this report in the interactive analyzer, or submit your own file for analysis.