Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4db7addbdb4e0b5…

MALICIOUS

PDF

83.8 KB Created: 2021-06-09 00:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 64e5d2c84e25235d4087eee122dfedee SHA-1: c66215950e1717c47f2222cef6b8abb6dd050feb SHA-256: d4db7addbdb4e0b56185b13e97515fd66de4c8e4c3cd96e9ef81bd04eec69ca8
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, combined with numerous extracted URLs, suggests a phishing or malware distribution attempt. The presence of external URIs and link farm characteristics points towards a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://archism.ru/pbw?utm_term=es+file+explorer+black+mod+apk PDF link annotation
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/bowefilak_resim_lafudelituwili.pdfIn PDF document text
    • https://nawikavo.weebly.com/uploads/1/3/0/8/130814462/faviwabozun.pdfIn PDF document text
    • https://tijisifexabid.weebly.com/uploads/1/3/1/0/131070771/3972797.pdfIn PDF document text
    • https://magojumenuta.weebly.com/uploads/1/3/4/3/134361537/bazovezisesezem.pdfIn PDF document text
    • https://komakuzafoge.weebly.com/uploads/1/3/4/5/134576335/teremifubavese.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/8171343.pdfIn PDF document text
    • https://vilewojux.weebly.com/uploads/1/3/0/8/130874250/39683afcf7.pdfIn PDF document text
    • https://kewusubeve.weebly.com/uploads/1/3/4/5/134515363/merepix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonumutat.pbworks.com/f/what_kind_of_cookware_is_safe_for_birds.pdfIn PDF document text
    • http://sukagafamo.pbworks.com/w/file/fetch/144729609/71658258934.pdfIn PDF document text
    • http://patimedudemu.pbworks.com/w/file/fetch/144657213/math_textbook_six_grade.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/jopelivof.pdfIn PDF document text
    • http://vijewiriw.pbworks.com/f/james_patterson_books_printable_list.pdfIn PDF document text
    • http://neruwuk.pbworks.com/w/file/fetch/144420417/how_to_enter_bios_acer_predator_helios_300.pdfIn PDF document text
    • http://pimepovume.pbworks.com/w/file/fetch/144480678/lomegolobofanuxerig.pdfIn PDF document text
    • http://lipadune.pbworks.com/w/file/fetch/144414207/rofosibakiwejojidopuwa.pdfIn PDF document text
    • http://lumoxag.pbworks.com/w/file/fetch/144718920/how_does_unemployment_rate_affect_economic_growth.pdfIn PDF document text
    • http://ximusutoj.pbworks.com/w/file/fetch/144722547/how_to_get_google_translate_in_excel.pdfIn PDF document text
    • http://jopamedet.pbworks.com/w/file/fetch/144445029/reading_and_discussion_questions_the_lottery_answers.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144564963/javujamuwenuwaj.pdfIn PDF document text
    • http://lakobun.pbworks.com/f/bully_anniversary_edition_apk_obb_highly_compressed.pdfIn PDF document text
    • http://mupoxulo.pbworks.com/w/file/fetch/144860193/self_esteem_activities_for_5th_graders.pdfIn PDF document text
    • http://zinezukajawe.pbworks.com/f/voicemail_recovery_app_android.pdfIn PDF document text
    • http://bokibagaror.pbworks.com/f/beginner_piano_songs_free.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/f/how_to_set_up_voicemail_on_alcatel_go_flip_phone.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/w/file/fetch/144487617/rise_of_the_super_germs_science_world_answers_september_17_2018.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/w/file/fetch/144618720/1422434414.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_off0001083e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 5532 bytes
SHA-256: f9145764230dc6cdb8ab6393bce73c7fd75f19e8f10df37c969657d13798d893
font_01_sfnt_off00011af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF6 10884 bytes
SHA-256: ad174a9c021c691b3fe7177afb0dec9473adbd9109c7a37ef53c02abb3b83fb8