Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f71663608fa53ab…

MALICIOUS

PDF

73.5 KB Created: 2021-06-09 14:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f1499bb4a35d71f3119378c9ece0fcf4 SHA-1: bdacc5c0a988dca04f2add3cd91809714e7bfd1f SHA-256: 4f71663608fa53abe397e87a3c9dd78456fc414368cddff364177a67ba7577a9
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 prominent URL pointing to a domain associated with malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm designed to host many links on disposable domains, further suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synerhu.ru/pbw?utm_term=thoptv+download+apk+free PDF link annotation
    • https://nuwoveforu.weebly.com/uploads/1/3/4/0/134099073/niselomab-zivulapadula-bugufigawu-dudaloremas.pdfIn PDF document text
    • https://wapaberupuz.weebly.com/uploads/1/3/5/3/135397773/zolokakov-jigotab-rukonigimoge.pdfIn PDF document text
    • https://dapinolun.weebly.com/uploads/1/3/4/7/134762022/8025573.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4418747/normal_60b32f2427500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_6035312442902.pdfIn PDF document text
    • https://fosisejabevenot.weebly.com/uploads/1/3/5/3/135398983/6840f6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_6056d5e772172.pdfIn PDF document text
    • https://xejukosaxup.weebly.com/uploads/1/3/1/4/131437924/0bc7ca6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fe7899-c378-451b-be16-3c413fbdb5ee/29348013861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/035d17e7-457c-4809-9a91-4314a591915b/depression_era_recipes_australia.pdfIn PDF document text
    • http://vasoxekisede.pbworks.com/f/crepusculo_4_pelicula_completa_en_espaol_latino_parte_1.pdfIn PDF document text
    • http://gufabewa.pbworks.com/f/21282019504.pdfIn PDF document text
    • http://fawugomem.pbworks.com/f/descendants_1_full_movie_2015_free_download.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/f/how_do_i_get_presets_for_free_in_lightroom_mobile.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/f/how_to_sign_up_for_twitch_prime_with_amazon_prime.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144574992/beziminalitefarapev.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/f/virtual_villagers_5_new_believers_apk_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e28c5db-81b4-45a5-a5d8-b37fe8e87072/what_is_the_best_burr_coffee_grinder_for_home_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/977707f0-e15f-46b8-9354-f146f6f59dd6/6998154576.pdfIn PDF document text
    • http://naxoxututal.pbworks.com/f/how_to_get_roblox_studio_on_android_2021.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144574977/guia_par_biomagnetico.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_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 5116 bytes
SHA-256: 2c4ccb65da1620030aaddfedfc6dddf68c96af2dd8be795bdf64984456078f25
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 10664 bytes
SHA-256: ecb860617939275200a9f16fd41ae4c7cb17c4febd5f1b3bc0b197a382cde3e8

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