Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9ad98a0c1b7c1e…

MALICIOUS

PDF

125.9 KB Created: 2021-06-08 15:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a07200f6aa9b960ebdc7ff97f1994675 SHA-1: 8c1cb9915bd2bc02546b856f3892f6dffa5b99c9 SHA-256: fb9ad98a0c1b7c1e07929a95a11901ac70baa32cf69f6d541e27cee50696c852
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a site related to 'mbti personality type test questionnaire pdf'. 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 embedded links suggest it's designed to redirect users to malicious content.

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://ketchas.ru/pbw?utm_term=mbti+personality+type+test+questionnaire+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446034/normal_606878ede2564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463543/normal_603fb05b13154.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485301/normal_5fcdbcad59dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_601b29537b25f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_60bc676fa2ac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5fd77ffd5c8dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fd7c55fb8f61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugozamuxika.pbworks.com/f/autoloader_bb_9900_os_7.1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a93a9b5-3ff3-4203-9c3e-0eb81db07cf8/six_sigma_green_belt_body_of_knowledge_asq.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/carrom_pool_mod_apk_download_latest_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28713068-7f76-41ae-831a-be9b8a0478f8/how_to_become_a_certified_vet_tech_in_florida.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144758010/78287463996.pdfIn PDF document text
    • http://raravisu.pbworks.com/f/slumdog_millionaire_full_movie_hindi_download_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dab9f43-d0c4-4f52-9bf9-c6d1c2736633/pifodasowodikajofej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0817d242-8f67-43e2-8994-ada5e6f96bb9/cch_bn_cu_th_b_kho_trong_fifa_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/addc49bb-83d1-4b8b-a3f8-cbe705ca1c73/how_starbucks_saved_my_life_tom_hanks.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144684510/vpn_for_pc_free_download_windows_10_64_bit_with_crack.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144412818/how_to_find_inner_rim_width.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e559fa2-1e48-4deb-b207-ba36cc048d44/wejatubakizuletubaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d056b3a6-0ca4-4cd1-a26f-7fae94e1c10b/lofonujojogupewiwovatira.pdfIn PDF document text
    • http://wotasaful.pbworks.com/f/51235053162.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_off0001ac79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC79 5408 bytes
SHA-256: 99a4869ce67cdb88235aebb158f0303e5ae24d91187a7d0b6e08e439afb1c76a
font_01_sfnt_off0001bef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEF4 12416 bytes
SHA-256: 10e2dcd83da6077e9614f0c558cc850f813accfdc646249018f5c52214c2b3d5

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