Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a91f3e5dc6fee55…

MALICIOUS

PDF

70.0 KB Created: 2021-05-09 16:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5137fd0ea4658ba991f8e681c636938c SHA-1: 8b5cb9776792e8e4185476d2505e094eabd98643 SHA-256: 9a91f3e5dc6fee55d1478d614267e85418f8f1a6010e326b2ef111e3c0fc86ce
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=integral+calculus+problems+with+answers PDF link annotation
    • https://cdn.sqhk.co/munuluxel/RvhmheK/losung_puzzle_box_level_58.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/jl8ihgi/bupujuzogemufem.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/bgibaeM/answer_interview_questions_about_yourself.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454809/normal_605e1a4af3d5d.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/jbQd1gg/world_of_wonder_minecraft_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/piredonina/hahbGhf/58820752435.pdfIn PDF document text
    • http://xanevejesofag.mygamesonline.org/5694291274.pdfIn PDF document text
    • http://xuxikurov.mygamesonline.org/arthritis_back_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388174/normal_600305287bec0.pdfIn PDF document text
    • https://cdn.sqhk.co/xozirijor/idfghia/dora_world_adventure_2006_library_dvd.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/pLjfih0/93160754159.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/pjd0ihh/65594545864.pdfIn PDF document text
    • https://cdn.sqhk.co/pinepopowig/gegfgjI/3d_deer_nature_live_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/hehchbs/super_tank_rumble_mod_apk_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/O32ieOB/square_quick_amounts.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/bk8hdWG/oneplus_new_buds_leak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/baby_girl_names_2019_unique_with_meaning.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_92ce24623eb747f8b25785e8f0c0c355.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_7bc47d81b4fb4471af19e65718259058.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_f1452c9a1f77434d95e36c77487f445c.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_86eb1a1fa7c64896b9e40dbd2a5d9c50.pdf?index=trueIn 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_off0000d2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BC 5516 bytes
SHA-256: e74acc19614a4c0ced088c86df34b3e80b7245f43d419a0c86506a7bffef7bf9
font_01_sfnt_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 10892 bytes
SHA-256: 091d11bd7d2886e5c009a2d15ad18a5342afb1ab9f44ed000bbc2f298346a928

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