Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24bba25a3572910…

MALICIOUS

PDF

102.8 KB Created: 2021-04-06 11:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e94572f85c064e510ba6cccb97cabe51 SHA-1: 444b63c4a30cde1cb0488f33dbaaafddf4ca3b65 SHA-256: b24bba25a35729105d86dee2544db7036300cca2568e8b0167206ec99c88bcd1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous URLs, including suspicious ones like 'jumiwimov.ru', suggests the primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://jumiwimov.ru/aws?utm_term=the+jedi+path+prophecy+of+the+chosen+one PDF link annotation
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/gdSK2ZL/new_york_tourist_attractions_map.pdfIn PDF document text
    • http://fasad-dom.site/14625711453egb94.pdfIn PDF document text
    • http://kemytbok.xyz/rights_to_purchase_common_stock_at_a_fixed_price_over_a_specified_period_areev1wf.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/7uhjNgg/kiss_of_war_sniper_ad.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/Adhjchc/golf_hitting_net_mesh.pdfIn PDF document text
    • http://realnoe-obshenie.online/gagasutawebalpobp.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/jdhe5i2/whatsapp_plus_apk_v6._50_latest_version.pdfIn PDF document text
    • http://dusanaputojinon.mygamesonline.org/fagetutep.pdfIn PDF document text
    • http://legendnat.space/xegirobixenolupafolu69yzi.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/jaihkjD/motorola_razr_2019_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/zdjecAD/smd_components_soldering_methods.pdfIn PDF document text
    • http://fatunatet.getenjoyment.net/48140301585.pdfIn PDF document text
    • https://cdn.sqhk.co/zipedufipiz/0gfigMp/jobererenupesajuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_06837795d78e4845a99f49f9fb1f88e1.pdf?index=trueIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_802ed69033f2430a96f92bfa068ddbb8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c48d11-2e68-426b-b0e3-1bd6e712a85e/62651538701.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_572cf1e22d4344fba6d374d05fd79efc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea996cb-7b33-4afa-8996-aed27620054b/bissell_proheat_turbo_2x_manual.pdfIn PDF document text
    • http://saluwagasa.onlinewebshop.net/18317792447.pdfIn PDF document text
    • http://fazovalekotevo.onlinewebshop.net/wixenefafixagagokubi.pdfIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_9cd85ec3438146ea827df712df86805e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b40f0b-0d1f-4cc4-9f41-1462344e81f1/stephen_hawking_medical_diagnosis.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_off00015544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15544 5340 bytes
SHA-256: d8d64f818f32ef9b9ec02fea3517bc4cc2bad151c612ea1f6123aabf5aa63273
font_01_sfnt_off00016774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16774 11316 bytes
SHA-256: 28a77b8b8db3c404bfba609a2158505909faa6e3485c1bccb38f8dc3eb06c23f