Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a56a8d5c159a84c…

MALICIOUS

PDF

82.6 KB Created: 2021-04-01 08:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cac8ee1503fc86ce6161d078b68bf4f9 SHA-1: 7cd2a635b262c4ef8e4416edbd7c136c058f2d20 SHA-256: 7a56a8d5c159a84c0274b0a172789d12af07679eed269b285aebe91df309909e
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, with one notable example being https://golowaki.ru/strik?utm_term=sig+p229+select+compact+review, suggesting a redirection or download attempt. The PDF structure and embedded links point towards an attempt to direct the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=sig+p229+select+compact+review PDF link annotation
    • http://ziposodepow.mywebcommunity.org/muxugapiba.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/gihbijX/my_cloud_photos_auto_backup.pdfIn PDF document text
    • http://nudevego.iblogger.org/strength_programs_for_runners.pdfIn PDF document text
    • http://fulokixowo.scienceontheweb.net/kerodebutumekikibugiw.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/PVibjhp/98803863001.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/geBdrd3/sports_live_tv_app.pdfIn PDF document text
    • http://norasuzajo.mywebcommunity.org/tixibup.pdfIn PDF document text
    • http://wurijudopala.22web.org/novigokanufusosekazagufeb.pdfIn PDF document text
    • https://rokaxitifefisol.weebly.com/uploads/1/3/4/0/134040577/e1360eed4b0e0a.pdfIn PDF document text
    • https://cdn.sqhk.co/bofilewidil/dgYgjhf/global_gizmos_bubble_fish_tank_tube.pdfIn PDF document text
    • https://zawanudodulir.weebly.com/uploads/1/3/1/4/131452903/kexot.pdfIn PDF document text
    • http://masovizifuzaro.iblogger.org/inequalities_word_problems_worksheet_kuta.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
    • http://xarilupinedup.myartsonline.com/aprender_ingles.pdfIn PDF document text
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_fc2928ebfb004aeaa8901955b8ae63f1.pdf?index=trueIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/tet_2020_answer_key_download.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_9d0b04947b7b49cd9b41bcfe7ebee425.pdf?index=trueIn PDF document text
    • http://sozijajetazojuk.epizy.com/14041159402.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_69ac33e94cca435889bf99e22fb31993.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_89e3dde0b019423fac813e25ad2a633e.pdf?index=trueIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_e8e06eb7c56f45908da593c38aa59104.pdf?index=trueIn PDF document text
    • http://fezigaf.epizy.com/bogleheads_book.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_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 5476 bytes
SHA-256: d66746545611c37bf4dc0d4ea73dcd28f744f6dbeea1953a0128ca3346198bf4
font_01_sfnt_off000105f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F3 11444 bytes
SHA-256: e5a38d3a18ff428160ea6ecfac8db2d69ed1043714357b42fbd3fd5271da72fa
font_02_sfnt_off00012ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCF 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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