Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7604f8e8e13e48…

MALICIOUS

PDF

79.7 KB Created: 2021-02-12 14:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f8411fc42547e9e252800ac8f3c6e45b SHA-1: 59b01f980a314c1f129055121bd8ad5ce45934e4 SHA-256: 5c7604f8e8e13e4872e6c796ea4d400b93756c6d97ecfa3bb6bb366a305b7c76
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious 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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/wb?keyword=if%20a%20woodchuck%20could%20chuck%20wood%20answer PDF link annotation
    • https://feboratopaw.weebly.com/uploads/1/3/1/3/131383734/muxexegejumamebuj.pdfIn PDF document text
    • http://naturmilans.fun/910906455305dflp.pdfIn PDF document text
    • https://gixebodaloru.weebly.com/uploads/1/3/1/3/131379223/4e7fe7f7.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/Ujh5j44/39591943162.pdfIn PDF document text
    • http://sfhgfje5df.xyz/business_process_change_harmon6x61t.pdfIn PDF document text
    • http://probmake12.xyz/89767675919tvscc.pdfIn PDF document text
    • http://natfreshik.fun/tamuzi7bzhs.pdfIn PDF document text
    • http://twenty-promo2020.ru/89921646947aw9io.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/FwNihKF/learn_to_draw_monster_high_characters.pdfIn PDF document text
    • https://lapolepep.weebly.com/uploads/1/3/1/4/131406498/vifewamex.pdfIn PDF document text
    • http://dreamingdeveloper.com/pekizepagukanovete7aevs.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/1332318.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/2974367.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/bjf9jab/22584239622.pdfIn PDF document text
    • https://cdn.sqhk.co/reposivekow/jdjj9Wm/nirvana_game_of_life_no_download.pdfIn PDF document text
    • http://reassurez-moi-fr.info/dustwallow_marsh_horde_quest_guidepkrb9.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/zewimu/85563007025.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/nuvukemajewemotavamela.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/advance_wars_like_games_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/90603810301.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_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 5204 bytes
SHA-256: be12de7665bf535a170460e56bbf11c2490f7fc94336c06a34eaad96997c1dfe
font_01_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 11372 bytes
SHA-256: bf65ba556ecd7249e0b68bfaeaf32b9f69917fb3e689ce55ec22cd29a677a4a8

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