Malicious PDF — malware analysis report

Static analysis result for SHA-256 a866ac25b93802d6…

MALICIOUS

PDF

78.3 KB Created: 2021-03-02 12:55:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0aba056b18b060389959473431c28b2d SHA-1: 4cf3e4487f474a77df126ffee710a1ddc69b118a SHA-256: a866ac25b93802d6ef506d216e6db1ad85bfc69a56e3b803c0d8a50d773b9b2a
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading unwanted software or accessing phishing sites. The presence of a 'download button' heuristic further supports this phishing lure.

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
  • 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.
  • 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
  • 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=psiphon+advance+100+handler+apk+download In PDF document text
    • http://sedouche.xyz/dreamweaver_cs5_lite_portable_freewr1cy.pdfIn PDF document text
    • http://jidokove.scienceontheweb.net/is_a_transmission_flush_necessary.pdfIn PDF document text
    • https://cdn.sqhk.co/goseluna/difiiij/32503617747.pdfIn PDF document text
    • http://sukutoxuwurif.mywebcommunity.org/miguel_street_chapter_1_summary.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/latajevanomavixaselipikal.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/LDQhhid/sound_recording_program_ubuntu.pdfIn PDF document text
    • http://sallely.xyz/julorenemakobovozexoqubrf.pdfIn PDF document text
    • https://vijamosikafej.weebly.com/uploads/1/3/4/7/134772382/sutosegowopuse-wowunaritapo.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/314e4e243e6fee2.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/1499096.pdfIn PDF document text
    • https://fobulosarurek.weebly.com/uploads/1/3/3/9/133997379/e2ded00f232eb0.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/vivonejurujisuwoxila.pdfIn PDF document text
    • https://xefezabegeritaj.weebly.com/uploads/1/3/1/3/131379478/7645037.pdfIn PDF document text
    • http://geparup.scienceontheweb.net/diary_of_a_wimpy_kid_the_long_haul_full_book_online.pdfIn PDF document text
    • http://yandex-delivery.cc/troy_bilt_tb425cs_partsa4rjo.pdfIn PDF document text
    • http://vrestoran.info/80060725887j6auc.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/3991883.pdfIn PDF document text
    • http://znalomstvavip.site/warframe_how_to_get_ignis_wraithmyzb7.pdfIn PDF document text
    • https://daradila.weebly.com/uploads/1/3/1/4/131438164/zokinomireduza.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
    • https://s3.amazonaws.com/rakabexozu/guzagirezonosoronem.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/eenadu_epaper_online_today.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/filatex_fashions_ltd_annual_report.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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 5280 bytes
SHA-256: a9a028fd846db2ee19ec9e1155a36b5403575ea4f6d0c7ef2ae34123c6570bd9
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 11200 bytes
SHA-256: 20a77d7816a599ffd22caeefc27ef6c4c210c394eda15d0c38494afa7a930797
font_02_sfnt_off00011d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34