Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b466cf581b6fc8…

MALICIOUS

PDF

79.1 KB Created: 2021-03-16 00:59:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c8a7dbc9a753eae50d1b343c7e69d9f2 SHA-1: 08073323dafee2c8936d9c5a99bb893bc7171aad SHA-256: b6b466cf581b6fc8b7d2326914c4ac4ee7326b1cb95c79c1e08e1c966461dac3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/123?utm_term=ti+83+calculator+online+free PDF link annotation
    • http://lekezoreg.22web.org/stardew_valley_lewis_gift_guide.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/the_accidental_prime_minister_book_in_telugu.pdfIn PDF document text
    • http://gta-msk.ru/assistant_accountant_interview_questions_and_answersii6x4.pdfIn PDF document text
    • http://storeplus.pro/43075991290u6p8i.pdfIn PDF document text
    • https://cdn.sqhk.co/posogamumut/d8YXgfv/74446617828.pdfIn PDF document text
    • https://cdn.sqhk.co/penunotati/njbibii/fifabijupijufiniluditaguz.pdfIn PDF document text
    • http://pearhaidhr.fun/cover_letter_for_government_job_templatev8bbx.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/jhaVvgc/bounce_back_little_mix_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/jfidJeL/printer_3d_model_online_maker.pdfIn PDF document text
    • http://bexixibeguben.sportsontheweb.net/coach_quotes_letterkenny.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/3bafc6d6-bfef-4ab0-9077-01a96e0d458d/how_much_do_foster_parents_get_paid_per_child_in_philadelphia.pdfIn PDF document text
    • http://vewajelawukos.rf.gd/brandon_flowers_crossfire_sheet_music.pdfIn PDF document text
    • http://likasiz.epizy.com/4865507725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9355d761-0dfa-44ba-8416-aedf0f61fdb1/what_type_of_bread_can_you_eat_on_a_low_fodmap_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c14400-85b0-460e-a800-07a9769eb157/list_any_two_operating_system_software.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_33c1978c74be4cbabc6e9cfc428aa421.pdf?index=trueIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_cded76f582ef434f97a831988729fe81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c72a9d-fbfa-4879-b06a-7a4b9acb9104/vokak.pdfIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_96ef082876ac48c2b8d09af5d7779de0.pdf?index=trueIn 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_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 5004 bytes
SHA-256: 62623256b57de2bc2e5c0d8e6ef81e23035e2972cf23767f3fe195ddac9cc8dd
font_01_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 10920 bytes
SHA-256: 3e402145dd45e5e9d1ca10f44635aa5d17c59bdfb2c29ae0c035a9871f956e2c

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