Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b239d0fdb6fc49…

MALICIOUS

PDF

88.0 KB Created: 2021-03-13 20:59:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 780bb21263aa53950aaadf4afa4d2845 SHA-1: 585df72be55dc6220d37d4594bd5bf58648a7059 SHA-256: 37b239d0fdb6fc49b84054be661a6163cad157ddcbd60c63dcdf72ab1e8d1653
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical alert for a link farm and a ClamAV detection for a phishing trojan. The document body references 'Call of duty game app' and the presence of numerous external links suggests a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate potential for malicious JavaScript execution or redirection to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/123?utm_term=call+of+duty+game++app PDF link annotation
    • https://cdn.sqhk.co/dazibewibu/gOjbhjh/30380552201.pdfIn PDF document text
    • https://cdn.sqhk.co/lomokubaf/heicW08/drum_set_for_toddlers_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/ghw1sbC/super_nes_emulator_android_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/haPG9ja/sufose.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/dc41bb23-e3e9-4961-b3c4-17eea4f9e2ad/online_spy_camera_in_pakistan.pdfIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_da6b377ccf204a70ae7cc4643e167e95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9456d31-7eb2-4f9a-ad07-a702fa7ae8c4/linksys_ea2700_password_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/4709183744.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/riwadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a904261-bb9f-4848-89f0-cd1ecea3f46f/caterpillar_forklift_code_e-24.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d55fbf9-1071-4d46-8fd7-ef4690fab169/the_one_thing_gary_keller_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f8fc3f-da42-4e68-a13b-f3a0189e473e/cuisinart_fondue_pot_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d08abb7-3c6f-4573-81b0-4b3c56cb843c/documentation_definition_in_system_analysis_and_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c276aab8-d2ed-40d0-8c5a-d0e734fb2f52/how_to_connect_roku_to_alexa_dot.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/vofowikonopenokavap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26213e82-104d-46e2-bba2-673fd0194390/python_numpy_random_float_range.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dacfa49e-6f20-4103-ad07-c6884c41524c/87431288353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db8c2b65-d805-4988-afa1-8a1b08503e24/75727236897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4464e671-012c-4c3a-a950-a9b80103abe9/sezuk.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/zegarek_mski_casio_g-shock_sky_cockpit_ga-1000-4aer.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_00a86ad29e7b4cf08e18abcc1cb951d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de9d29c0-3eaf-47d6-9097-67a6f510051e/47031579926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed8fb25-2cee-422a-98f0-a2080af6513b/serisozonofumesifulitaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c06cc8-2c89-48d7-981e-129f9d1267cf/dlink_powerline_firmware_update.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/37241584945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43086d53-b14d-46e9-8054-f3c95538d308/how_to_get_the_total_surface_area_of_a_rectangular_prism.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_off00011b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5B 5092 bytes
SHA-256: 4f5aa29e97c48a01dc43f594fcfecd114ecf711cc5816ec21aae0604f5e4173b
font_01_sfnt_off00012cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB2 11424 bytes
SHA-256: 1cdb9156bbfd3f5fd64ebe1f0dd142b71598bce0c9d13ae1d627470bc09b55ce