Malicious PDF — malware analysis report

Static analysis result for SHA-256 9abf38d6d6d0e956…

MALICIOUS

PDF

80.5 KB Created: 2021-04-19 23:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3330451ef2d0f1d195426ee19dc11802 SHA-1: aedf716a1985c1dd8cbe7033e04753f1a15b4fa4 SHA-256: 9abf38d6d6d0e95663dbca4138a26374b84d57430a2099b200ba67172b67fb1e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to trick users into clicking the malicious link.

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://kuzutuzo.ru/strik?utm_term=english+grammar+tenses+worksheets+for+grade+8 PDF link annotation
    • http://tefiwofo.22web.org/electric_circuit_1_problems_and_solutions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470540/normal_604fc25046407.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/adobe_reader_free_download_for_windows_8.pdfIn PDF document text
    • http://jimurizo.22web.org/85038707309.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446273/normal_600532f869dfc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_4b54d65fc66d4fe1ae7e19c34aaddf39.pdf?index=trueIn PDF document text
    • http://kopolug.myartsonline.com/disiwaxezejaxofexanenezog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4d0811-6494-48bd-9177-28ec0434395b/focusrite_scarlett_2i2_bundle_price.pdfIn PDF document text
    • http://luvepel.myartsonline.com/38077238591.pdfIn PDF document text
    • http://ralivapoked.epizy.com/mogapupipikikir.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/canon_eos_utility_2._6_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/nalatebivovijoxiferegowub.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/beko_8kg_washing_machine_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28cb4d87-3627-4d94-9038-ec09650d0d7e/coleman_3000_watt_generator.pdfIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_1dd64c51a0894758b4f42f45c356a3ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3584f63a-625f-47ee-8c48-9675e0c10134/goruwuzewotuwigurorefe.pdfIn PDF document text
    • http://bamasagure.epizy.com/nabefawatav.pdfIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_ad42637c70f446bab17bdc404255bed2.pdf?index=trueIn PDF document text
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_3735aac3814445dab8fffa6b638447c0.pdf?index=trueIn PDF document text
    • http://tijuvewoduga.onlinewebshop.net/muboxagozarereser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae09e57-a432-4295-bc55-d02019ddb05f/45682247493.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_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 5628 bytes
SHA-256: 9b09660bcf188baa372515d8a8b3d2b883281b52b3a012e35f43538910818401
font_01_sfnt_off00010fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 10780 bytes
SHA-256: 07038459bbe3c4d360b1ebded1ccac8bbbf7c23435d032a495123a51a1d1204c

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