Malicious PDF — malware analysis report

Static analysis result for SHA-256 703e9f3053f05958…

MALICIOUS

PDF

81.2 KB Created: 2021-04-22 09:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d02fb8c40845f1f12b854a14774bc7c7 SHA-1: acdf52964662eb5dfb8223de8a2b3ea705c8b33b SHA-256: 703e9f3053f05958356c566f20d1180c40fad0700b5652e412d45369f947eacd
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The primary URL, https://jacksth.ru/strik, is associated with a search query for appliance error codes, suggesting a lure to trick users into visiting a potentially malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=whirlpool+cabrio+washing+machine+error+code+f51 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5fd10df2e2446.pdfIn PDF document text
    • http://tiburozikibuvex.22web.org/adobe_premiere_pro_2016_minimum_system_requirements.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/yard_machines_mtd_tiller_manualgnrbf.pdfIn PDF document text
    • http://generatorsale.ru/synonyms_meaning_and_exampleslizvh.pdfIn PDF document text
    • http://strgb2.ru/99056965835pdum3.pdfIn PDF document text
    • http://devicesprotectionforusers.site/54620920473zvt1t.pdfIn PDF document text
    • http://baltika-trans.ru/zifovukinofowolexumunumwsic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fce716a76247.pdfIn PDF document text
    • http://blog-millionaire.buzz/wizudijarerezijemagufijmkvs6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_60171fba6f3b8.pdfIn PDF document text
    • http://health-top.ru/51581929347sn9z4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465548/normal_5fc5af7e9fbfe.pdfIn PDF document text
    • http://fredo.bike/alexander_henderson_reading_answer_key7z7ar.pdfIn PDF document text
    • http://frasqen.online/8465181750421z2n.pdfIn PDF document text
    • http://deemonatrafik.xyz/quanto_ganha_um_agente_da_policia_federal21bi6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_6013ebee38384.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/91dfa309-a41c-4bf7-b577-d6dcc91f2d69/24821755771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51678c0a-ec0f-415c-a1ca-111ca9db2782/segojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f58a3dd-bb56-447b-8d3e-a46d57ae0dd3/where_is_the_lint_filter_on_a_top_loader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f72894-0df9-4be4-a17a-e4f739d2e6ea/is_coway_air_purifier_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3dfcdae-2eb4-4952-a02c-987f32f28a09/citizen_navihawk_at_eco-drive_jy8030-83e.pdfIn PDF document text
    • http://riwasepe.epizy.com/zerikizuzulase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77c8b0d-5102-4182-b87f-4a4a8463b972/monster_squad_movie_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c680d7c6-92bb-4036-b6fb-2cfbcb8db980/four_past_midnight_book_review.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_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 5988 bytes
SHA-256: 9f097bb640743044d42e07ed5ad56436441f8c243866b1675fa0aab6c446fa25
font_01_sfnt_off00011296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11296 10536 bytes
SHA-256: 7c19765c0f7b6d0c98cd043cf9991ce6bddc72aca03507eb7275f56f79a8027d