Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33b9264216cc9eb…

MALICIOUS

PDF

74.1 KB Created: 2021-02-26 17:52:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 395841f717eb00a8c63ec7c063e9aaf5 SHA-1: 973922c27d56136d15f859916a87ee0ed46e46cb SHA-256: d33b9264216cc9eb9965973757550b3b5a7cefacd44c30aab21eeca612cb9551
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, indicating a link farm designed to redirect users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were extracted, the overall structure and link distribution strongly suggest a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/award?keyword=vba+programming+tutorial+excel In PDF document text
    • http://lazujifoxupa.getenjoyment.net/lumugijevotejubumunowumu.pdfIn PDF document text
    • http://labiosdewonda.com/lobeputobirojedomesuvonf3t5.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/marshall_valvestate_2000_avt_150_half_stack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_603487e84334d.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/joberowikajozetevotev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452381/normal_601ca82c8f1dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5fce8aad44b5e.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/76643976432.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/pewusa.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/how_to_plan_a_keto_meal_plan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5fd7ab4c6f97c.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/pleasure_without_conscience_meaning_in_telugu.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/magedupavonoduduzifidazep.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/jejereli.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/beats_solo_wireless_2_price.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/fobupojowojon/video_player_apk_for_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/carrier_02xr_chiller_manuals.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/9858122052.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/fudobev.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/45150859981.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/headphone_bass_booster_app.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_off0000e68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 5248 bytes
SHA-256: 6949342017fd0ef6e5d14d0b977d8566ad94aad51ee23dfa9aff19ca40e8f5b6
font_01_sfnt_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 10136 bytes
SHA-256: 92b7d6d327700a84eb071f4e5d3c7186c33d8a1a69004ff4911e5dd7c80c6988

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