Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d91cace3c8f26d…

MALICIOUS

PDF

70.8 KB Created: 2021-03-03 22:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ebb5a9a27bf90809fc43ed96d092c566 SHA-1: d8345312268c11fc60c55b7b47f97c3c87889e6b SHA-256: 71d91cace3c8f26dd0933fa1dd5e6912ff9d57149e3691b42034a452a6b9bc89
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating it functions as a redirector to malicious infrastructure. The embedded links, such as 'https://yafferge.ru/wix?keyword=2008+ap+physics+b+free+response', are designed to lead users to potentially harmful sites. The presence of numerous links on disposable hosting further supports its role in a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://yafferge.ru/wix?keyword=2008+ap+physics+b+free+response In PDF document text
    • https://cdn.sqhk.co/nujudemugipi/5AjbkHz/nizoxakev.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/how_to_set_time_on_avaya_partner_18d_phone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465024/normal_60230fd4512c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470218/normal_6036cc0c3bfbf.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/die8fMe/videos_de_plants_vs_zombies_garden_war_2.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/DjgfmwR/segolixowotujolapuduwa.pdfIn PDF document text
    • http://lenugaguv.medianewsonline.com/wordpress_custom_login_url.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5fdeb1666c2a0.pdfIn PDF document text
    • http://mirijesuwakug.sportsontheweb.net/what_is_the_subject_of_the_poem_the_raven.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/TijgePH/chaldean_numerology_planets.pdfIn PDF document text
    • https://cdn.sqhk.co/vofemolat/ihMjbgK/3d_parkour_games_online_free.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/wibedubosateg/cartas_abelardo_y_eloisa.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/tefoxukefaxigudazeruka.pdfIn PDF document text
    • http://pazepoxi.atwebpages.com/43032148651.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_off0000cb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB76 5396 bytes
SHA-256: e3d51a54439582225ff72f1cfe1ccb53ff23f92ad7b11a1c0bfc72f371f7e95f
font_01_sfnt_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 10172 bytes
SHA-256: b6a9788feb18b3b104d760fa87362da32e48471aee06fcc287d36d118fd13b7d
font_02_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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