Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cef0554d04ed8d5…

MALICIOUS

PDF

90.7 KB Created: 2021-03-27 13:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9b5a272317c5b62bcf36edf052ae26fa SHA-1: 20bae6903d4481cf2e9705fdeac16643e9cf33e7 SHA-256: 2cef0554d04ed8d58d8a90573b1ac2fc52150e78e35163d55d3dd4d7b72b9001
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple external URIs, with a high concentration of links pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into visiting 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://midufefew.ru/award?keyword=building+drawing+in+civil+engineering+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426682/normal_60374e940a007.pdfIn PDF document text
    • http://perfectiona.online/stihl_ms250_owners_manual55zzk.pdfIn PDF document text
    • http://babbieshop.ru/ubiquiti_nanostation_m2_default_ip_address59q2n.pdfIn PDF document text
    • http://podarokinsta24.online/calories_in_a_bojangles_cajun_filet_biscuiti367t.pdfIn PDF document text
    • http://cmbespaceclient.xyz/majibunuwedefibaqu1x2.pdfIn PDF document text
    • https://cdn.sqhk.co/nanovinojon/diayieM/meteor_storm_rocket_league_ps4.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/carpenter_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/niwexifa/hbcji80/download_game_super_stickman_golf_2_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379848/normal_5fe5a6ff51ab4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_601bfd2777900.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/rewepalazamiso/lugogunarigef.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/government_b._ed_college_in_kolkata.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/77130063133.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/83821934716.pdfIn PDF document text
    • http://liwetagosozel.onlinewebshop.net/blantyre_coma_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/budubi.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_off00012508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12508 5348 bytes
SHA-256: c7302e0b19a26c9486beb37ff6802b672c8688be2ae490ae9a3e428e588d2cf8
font_01_sfnt_off00013769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13769 11168 bytes
SHA-256: 59d09ae159ecfedd5c44c24fada4ff198863d9ce49356f03cb10a25fb2a5de62

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