Malicious PDF — malware analysis report

Static analysis result for SHA-256 96df390102a3d3b8…

MALICIOUS

PDF

72.3 KB Created: 2021-01-14 17:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 586f3d81d9a16c43ba2c47098dbac507 SHA-1: 7eb4aa130660791b1ac2b6640feff2a8a785e110 SHA-256: 96df390102a3d3b8a38cba98c7de3d97554d118e2ab5621e757da160195d4087
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically identified as a redirector. The document body, though heavily obfuscated, suggests a lure related to employment. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish credentials or deliver further malware via the linked sites.

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/123?utm_term=sample+letter+of+intent+to+hire+from+employer In PDF document text
    • https://site-1166687.mozfiles.com/files/1166687/pixowezavarog.pdfIn PDF document text
    • https://site-1178101.mozfiles.com/files/1178101/descargar_tiki_kart_3d_hackeado.pdfIn PDF document text
    • https://site-1168029.mozfiles.com/files/1168029/photo_finish_horse_racing_promo_codes.pdfIn PDF document text
    • https://site-1171608.mozfiles.com/files/1171608/kalarelutuxanefit.pdfIn PDF document text
    • https://site-1172895.mozfiles.com/files/1172895/shelterlogic_canopy_12x12.pdfIn PDF document text
    • https://site-1174733.mozfiles.com/files/1174733/speaking_worksheets_for_young_learners_of_english.pdfIn PDF document text
    • https://site-1173807.mozfiles.com/files/1173807/free_streaming_country_music_videos.pdfIn PDF document text
    • https://site-1178643.mozfiles.com/files/1178643/fuxedi.pdfIn PDF document text
    • https://site-1185944.mozfiles.com/files/1185944/keep_talking_and_nobody_explodes_switch_trailer.pdfIn PDF document text
    • https://site-1176079.mozfiles.com/files/1176079/28559773629.pdfIn PDF document text
    • https://site-1178541.mozfiles.com/files/1178541/nhl_scores_blues.pdfIn PDF document text
    • https://site-1236897.mozfiles.com/files/1236897/west_game_best_strategy.pdfIn PDF document text
    • https://noxetetejiv.weebly.com/uploads/1/3/4/3/134391164/niwixak-tezagekuxosa-jokujupa-tutefuruvipenuk.pdfIn PDF document text
    • https://site-1245332.mozfiles.com/files/1245332/vorubiribosuluxonizan.pdfIn PDF document text
    • https://site-1167993.mozfiles.com/files/1167993/wobixutivazur.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/bewibiwat/nativity_of_our_savior_portage_in.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_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 5168 bytes
SHA-256: 040825aa535902e04bfe73eb890fa92224e2f31e71ccb85dced97de1fe25b8e3
font_01_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 10572 bytes
SHA-256: ee07205b2ad1011f4198136168fdf43131b2aed40ea9eca037cbe92497a8767d

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