Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dc32f7a1048d00…

MALICIOUS

PDF

77.6 KB Created: 2021-01-11 23:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2bd279429449e96903e8745cb2540ea0 SHA-1: ce8cd062585e909cd295cfb58ad747a6c91d867e SHA-256: 87dc32f7a1048d0058f6d01d2df3479e1bd02a90c2f4a7f87ae21ed6048e13c0
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The embedded URLs, such as 'https://cctraff.ru/aws?utm_term=gb+whatsapp+apk++for+blackberry+10', are indicative of a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/aws?utm_term=gb+whatsapp+apk++for+blackberry+10 In PDF document text
    • https://site-1245376.mozfiles.com/files/1245376/attestation_pole_emploi_vierge_particulier_employeur.pdfIn PDF document text
    • https://site-1177005.mozfiles.com/files/1177005/space_flight_games_ios.pdfIn PDF document text
    • https://site-1168215.mozfiles.com/files/1168215/report_inactive_instagram_username.pdfIn PDF document text
    • https://site-1178359.mozfiles.com/files/1178359/30345465747.pdfIn PDF document text
    • https://site-1166084.mozfiles.com/files/1166084/mortal_kombat_movie_trailer_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5fafdac28de22.pdfIn PDF document text
    • https://site-1179300.mozfiles.com/files/1179300/aplasia_medular_idiopatica.pdfIn PDF document text
    • https://site-1171850.mozfiles.com/files/1171850/15646538689.pdfIn PDF document text
    • https://nujolekilerimiv.weebly.com/uploads/1/3/4/5/134501562/gujavitujura.pdfIn PDF document text
    • https://site-1178602.mozfiles.com/files/1178602/free_wallpapers_for_iphone_6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413109/normal_5f944652934bd.pdfIn PDF document text
    • https://site-1178359.mozfiles.com/files/1178359/bleach_tie_dye_patterns_sweatshirt.pdfIn PDF document text
    • https://site-1224402.mozfiles.com/files/1224402/moto_game_free_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/xasomegupur/hb2AGIn/52753549668.pdfIn PDF document text
    • https://site-1175818.mozfiles.com/files/1175818/microsoft_sharepoint_designer_cannot_start_microsoft_visio_2016.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 5728 bytes
SHA-256: 95be7bf6761f61a5ffc5ad9b8912d54fd83e86c39150f82f3c7ccb88996a7694
font_01_sfnt_off0001036a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 11192 bytes
SHA-256: 2fda3690e9e3813958a476f950050123883380cd5f0a0cb43bd7691f10b1044e

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