Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef42feef4a2a9b41…

MALICIOUS

PDF

86.8 KB Created: 2021-03-26 19:06:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7b98af393d62c1705f55357bffaaffae SHA-1: ad2369ff299f48e51897fa54b320779757a9c844 SHA-256: ef42feef4a2a9b414bcf7a10cd8241ad1ae63a8e63f852fe638abfc73f711c42
184 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 and are associated with redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, appears to be a lure for users interested in topics like 'apk editor video', directing them to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=apk+editor+video In PDF document text
    • http://buyfastedcircle.xyz/how_to_find_my_four_digit_zip_codeurqmr.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://jalosus.mygamesonline.org/solve_quadratic_equations_by_quadratic_formula_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/vjbHjjH/semaxarasidizadugurupa.pdfIn PDF document text
    • https://cdn.sqhk.co/vurikede/hgEPhe1/bawomimenuzasukil.pdfIn PDF document text
    • http://kimisorunutom.medianewsonline.com/7_step_air_brake_test.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zelonixen.epizy.com/kaputivilezolosezubamedum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a88236ba-f55a-470f-bbf3-3869df25807c/30644622742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9335b8-98a8-4aa1-9d9f-c326e04cd062/2018_toyota_camry_for_sale_dallas_tx.pdfIn PDF document text
    • http://vemevusakeke.epizy.com/peloxe.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/7492924176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b160aec-27d9-473b-b8e6-1c366ae21004/rigeriwuniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7449b05-e66f-4f78-9cd4-af6dcfbd95a8/51979183067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0390a22-769f-4f60-a819-cf2b50e2e25c/c_primer_lippman_6th_edition.pdfIn PDF document text
    • http://vapovalexuma.epizy.com/dovepuzajebun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644318c7-545d-4010-8164-965485d09e32/fresher_software_tester_jobs_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83348378-f129-4c70-80fb-ba4dbac3a469/how_to_fill_bowl_on_edelbrock_carb.pdfIn PDF document text
    • http://jopanitovoxa.epizy.com/27457187645.pdfIn PDF document text
    • http://kurivixudenetiw.epizy.com/3813686183.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 4328 bytes
SHA-256: d895e2a82f30ead4c39ac14fe1edfe1d5da7383ce45444dcd91ab7f27cd1c3b6
font_01_sfnt_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 11376 bytes
SHA-256: 3c66d50a62662a004338b7babe8fa299f32642ae0300b9dc7f2ce24ca5d592c5
font_02_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 10844 bytes
SHA-256: 5babe0e5685954c93a6be73b06e96bd3c35e55d7629f27bb35037f2673384dd0
font_03_sfnt_off00012b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B94 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
font_04_sfnt_off0001405c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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