Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9631d7e511c0b4…

MALICIOUS

PDF

83.3 KB Created: 2021-03-07 17:04:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3e659fd0ace304e8b5cf59b274944147 SHA-1: fa83948e9c512d1bc93b49596cde3018f7f5693c SHA-256: 2f9631d7e511c0b4a2b382a3d043a2d828f151daae4690759080a45c14bddbd5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body and extracted URLs suggest a lure related to downloading a driver for a Behringer U-Phoria UM2, directing users to potentially malicious domains. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

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://midufefew.ru/wb?keyword=behringer%20u-phoria%20um2%20driver%20free%20download PDF link annotation
    • https://cdn.sqhk.co/poronujefino/eihvgif/spider_color_run_superheroes_running_game.pdfIn PDF document text
    • http://ogranifruit.space/what_position_to_sleep_in_with_a_headache6u08f.pdfIn PDF document text
    • http://gratoramm.website/the_zookeepers_wife_full_movie_greek_subs6f2dd.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/xhdjuhf/roxega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458150/normal_60322233dc9b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fe204efd7c9c.pdfIn PDF document text
    • https://cdn.sqhk.co/mokevesin/hhZG3jd/robotics_companies_in_northern_california.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/CKijfgh/73496928647.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/yQiizOH/83891731058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453902/normal_603970bab06b5.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/HYhdwfw/petamuxigajutafovasimukog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_601cb766d484e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495065/normal_5ff7767cc8eab.pdfIn PDF document text
    • http://frankiearvelo.com/ratios_and_rates_worksheet_answer_key5qmyd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_119bf34b440d4d40aab8e6911c4ff366.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_ad4fa39936164032a580beab9ffa8e3f.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_47a9ae20c38943169c189b4678f1df7f.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_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 5640 bytes
SHA-256: 76bd0e8b72c9cb071f6cd4a6881b180e6df46a0e925f8ccc321a057e74996f45
font_01_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 10912 bytes
SHA-256: e7f513608d873872514cb71e5b35d0c2a3dbe291a5fb9d29918d35cbac8bc205

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