Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea1743d3443e9e5…

MALICIOUS

PDF

74.4 KB Created: 2021-03-25 04:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bd233aac9d610712adf684df64ebe37 SHA-1: 8be1ba0bb55eb6230208a2101348682d0b6aaa7a SHA-256: 3ea1743d3443e9e5f910819afaa9b645c822eb11f9168f61848d054fb1543192
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are dynamically generated or use SEO-like keywords, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://druttle.ru/award?keyword=understanding+and+using+english+grammar+with+myenglishlab+5th+edition+pdf
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/4327da0ff.pdf
    • http://mazafaka69pussy.online/perfect_aspects_of_verbs_worksheets_grade_5nlefh.pdf
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/8963787.pdf
    • https://cdn.sqhk.co/likunubiba/gf6hNia/xiratezemadezegija.pdf
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/vevixakuzekepegokut.pdf
    • http://bibuzikufaje.mygamesonline.org/73555779643.pdf
    • https://cdn.sqhk.co/tajiwikiter/2hhiaPg/uber_driver_salary_houston.pdf
    • http://rodisawikikofu.medianewsonline.com/fupiliwagogas.pdf
    • http://idealslim-italiaofficial.site/euro_truck_simulator_2_code_generatorcqzsw.pdf
    • https://cdn.sqhk.co/defisepeniba/NgiiiWf/stickman_falling_game.pdf
    • https://nozodipipagim.weebly.com/uploads/1/3/1/4/131438171/5537847.pdf
    • https://cdn.sqhk.co/sowuwinadapu/Aniggdy/fewixonejobaxom.pdf
    • http://lefilew.iblogger.org/papibog.pdf
    • https://cdn.sqhk.co/baruduwege/kLgiggs/video_editing_photo_song.pdf
    • https://cdn.sqhk.co/gepabafi/eVhh3je/life_after_game_download_ios.pdf
    • https://cdn.sqhk.co/pofevadamem/ijjfhgG/badland_winch_review_9000.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ratobewiwigu.atwebpages.com/88457922155.pdf
    • http://lawesiwewif.onlinewebshop.net/html_button_generate.pdf
    • http://kefujuvaw.epizy.com/plant_pathology_laboratory_equipments_and_their_uses.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e09a.bin
f192a6407e33f9b5cc8eb2a9407919935762eec41d8d7459c724d494242fa199
pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 5904 bytes
font_01_sfnt_off0000f49b.bin
c7ada32e14b0c9dfc82590b9386524c00473840479fad9b30f8ef8ecccc03931
pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 11476 bytes