Malicious PDF — malware analysis report

Static analysis result for SHA-256 2491597c0d492f71…

MALICIOUS

PDF

86.6 KB Created: 2021-05-15 06:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 25ce9a059a3e66011c94291841cec878 SHA-1: d100b06dda584ae3e1e3abdaf4fb237e55df5339 SHA-256: 2491597c0d492f711b8847beda32fc3263053aa32141e7c3ebf7625592fa584c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to a 'permit test cheat sheet', aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mezovuduw.ru/strik?utm_term=south+carolina+permit+test+cheat+sheet PDF link annotation
    • https://cdn.sqhk.co/jarogofef/1SYhije/89714014710.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/heart_of_worship_chords_key_of_e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5ffab437445ad.pdfIn PDF document text
    • http://tryadasert.online/start_late_finish_rich_by_david_bachfkqmr.pdfIn PDF document text
    • http://mivetys.xyz/heil_heat_and_air_units2st52.pdfIn PDF document text
    • https://cdn.sqhk.co/palezubifo/mjeJnja/xtreme_raceway_park_2020_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/aiiAgif/galaxian_nes_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452624/normal_602fee325c59f.pdfIn PDF document text
    • https://cdn.sqhk.co/kakezesarop/hdifhja/85644825571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_5fd33db6ce492.pdfIn PDF document text
    • http://save50.pro/4608705453l4irn.pdfIn PDF document text
    • http://gnoogle.site/difipezufif04ulp.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/wilcom_embroidery_studio_e3_crack_wiyeh15.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/fichas_de_trabajo_de_lectoescritura_para_primer_grado.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/a8006390-d3a7-44e1-a06f-66e2f091d61f/jon_saphier_the_skillful_teacher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4de96d-17c7-41d3-a0e1-5eb5edac8d40/how_to_study_for_aswb_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be42c609-574e-4eb7-84f0-0412187b0930/44643536058.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/635f43ce-a3d1-4e8e-b2e7-06ada01e94b7/carl_jung_theory_of_consciousness.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/63303412819.pdfIn PDF document text
    • http://disoluje.myartsonline.com/4486795510.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/papudiwasek.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/summer_bucket_list_2019_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/brother_p_touch_900w.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d003a129-f507-4662-b3ca-967a339b657c/lord_of_the_rings_movies_to_watch_in_order.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 5276 bytes
SHA-256: 053d9fef378c63eaf6323cc1c53ebb2a707e96ae7bc1313df56f9feeae2678e9
font_01_sfnt_off0001100b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100B 11612 bytes
SHA-256: 30287850c226471bda9c51bf152e6b4c02e2eb2e8ae4a1d31a2e78a66629cb92
font_02_sfnt_off00013799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13799 16076 bytes
SHA-256: d286e8b4d1cdafc5f769987bdccf7a6368ad55d0d3b8f98fd56bc2ae223999f8