Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cae6f00c4cfafa…

MALICIOUS

PDF

83.9 KB Created: 2021-04-23 22:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6a60857cf1fd6e5295f6cc4e11a32a91 SHA-1: ec10f48e6df9e8f3b45c5844258e8a3d2df045b5 SHA-256: 91cae6f00c4cfafad6786628d73b21897d6e86bf7f80282c96b694f1a585781a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or trojan distribution attempt. The presence of embedded URLs suggests an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://crophysi.ru/strik?utm_term=the+exorcist+2000+download+in+telugu In PDF document text
    • http://fuxarirudutosas.iblogger.org/platform_film_ke_gane_ajay_devgan_ke.pdfIn PDF document text
    • http://ecoterritory.store/all_guitar_chords_sheetd8rt2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462065/normal_605d50893670f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422637/normal_6008a3c998ca4.pdfIn PDF document text
    • http://zoo-taxi.site/can_you_manually_aim_crossbow_dark_souls9q3k7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_606ac3efcd965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_606da25965ef1.pdfIn PDF document text
    • http://rubisteq.online/wapilolitarajanizufuxasawqjsl.pdfIn PDF document text
    • http://thesalle.xyz/53456015132mgdya.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385197/normal_5ff698d3b7d11.pdfIn PDF document text
    • http://funapuz.iblogger.org/74065987897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451023/normal_606ddf8424245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464521/normal_5ff550afd5781.pdfIn PDF document text
    • http://passive-income.ru/411977524121t3lo.pdfIn PDF document text
    • http://servisvds.ru/david_batchelor_chromophobiakos46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0ba318f-e83e-4628-a176-a9d7996c581f/how_to_put_directv_now_app_on_lg_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1d79bf-f88d-46df-9d0b-e65fe0c04543/dalalumixunomad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f4e400-ed54-461b-873c-949fbfb44224/read_the_red_queen_series_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58624b57-8601-48c9-a463-35c8c2ccf01b/54286189449.pdfIn PDF document text
    • http://zerason.rf.gd/que_es_el_agar_en_microbiologia.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_off00010817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 5584 bytes
SHA-256: c47f6e8dbfb8160aad891d3aec52bb31b2e619df618d78aef27d6f5cb7e27a05
font_01_sfnt_off00011b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 11844 bytes
SHA-256: 2663af22a9ae39e541390e2d58f93110e9446dce454e6ff8a730de198c88f573

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