Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cd09d2a63bf0ca…

MALICIOUS

PDF

97.8 KB Created: 2021-04-03 15:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6f0ea4d7e2bae011b8b670387e1cb318 SHA-1: b3e8c6b02ff1ddadd2c95356732b1150f83314bd SHA-256: 43cd09d2a63bf0caaf75badddde2976e4eb3555c3d78735a2868a103df88f61d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://kuzutuzo.ru/award?keyword=objectives+of+berlin+conference+pdf PDF link annotation
    • http://insurancecarusa.com/photo_eraser_app_for_pc_freeonklj.pdfIn PDF document text
    • https://cdn.sqhk.co/bujomuvi/iifYjhk/lightroom_presets_free_dng_file.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/eGribFS/watudigolivitidofixa.pdfIn PDF document text
    • http://sowizibusi.22web.org/doubledown_casino_facebook_free_chips_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/gjBaUjc/pulumav.pdfIn PDF document text
    • http://coins24h.com/koduduxovaraxazubavgni12.pdfIn PDF document text
    • http://bloomwithdeanna.com/605650117110q9p2.pdfIn PDF document text
    • http://wisecreditscore.info/workforce_tile_cutter_thd550_replacement_blade1e2wk.pdfIn PDF document text
    • http://menformula.xyz/pathfinder_kingmaker_character_portraitsq06zp.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/salatul_tasbeeh_ki_namaz_padhne_ka_tarika_batayeylitk.pdfIn PDF document text
    • http://guwejino.iblogger.org/edexcel_gcse_chemistry_student_book.pdfIn PDF document text
    • http://prizinsta.info/crude_oil_chemical_formulawgih1.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/9Wgefif/3080683426.pdfIn PDF document text
    • http://prodive.su/how_to_clean_the_soleplate_of_my_rowenta_ironbk2v8.pdfIn PDF document text
    • http://startbastar.online/what_is_coming_to_netflix_in_january_20215bwib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gitipelut/hollywood_reporter_designated_survivor.pdfIn PDF document text
    • http://gebimosoruj.epizy.com/lesawutetemigolenu.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/shell_and_tube_heat_exchanger_design_excel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/brevent_android_pie.pdfIn PDF document text
    • http://dikuwipesunebo.rf.gd/bamibujikokekidum.pdfIn PDF document text
    • http://vazipodexemon.rf.gd/what_words_start_with_lynx.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_off000133ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AB 5032 bytes
SHA-256: 4fc81bb9aac1c64678ac15aef4cd80536c003e8b4144f0ccb4b9e5b12afecb62
font_01_sfnt_off000144d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D3 11964 bytes
SHA-256: 331020a14380e0267f24ba59982f9e2f546e385c7819c6249c89d5971fbc566a
font_02_sfnt_off00016bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BFD 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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