Malicious PDF — malware analysis report

Static analysis result for SHA-256 efec73d459df2791…

MALICIOUS

PDF

197.5 KB Created: 2021-03-16 04:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0f06e3556da572bad31f636085063f40 SHA-1: b66f180f0b0833b5763edfa33e1f8e02a59d143a SHA-256: efec73d459df2791fdbb476875be09d8b62c12f6113ef34bf9da0e5d44c89fc1
104 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and a heuristic firing for a visual download button, suggesting a phishing or social engineering lure. ClamAV detection and ML classification further indicate malicious intent. The presence of external URIs points to the document's role in directing users to malicious content, likely a phishing page or a further payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9529

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/award?keyword=applied+mathematics+2+lecture+notes+pdf PDF link annotation
    • https://cdn.sqhk.co/ranemagesoga/icThhjb/niviwanikolakuvopiziw.pdfIn PDF document text
    • http://reduslimitalia-official.site/sovereignty_crown_of_kings_guideffejz.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/aATjdEZ/fatiwevuduwize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461201/normal_600f4d7928353.pdfIn PDF document text
    • http://smartcreditcheck.info/496356421278cojl.pdfIn PDF document text
    • http://idealica-italiaofficial.site/244540260581phm0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445129/normal_604fec874a025.pdfIn PDF document text
    • https://cdn.sqhk.co/pitewomepe/cGYeTgc/download_now_perfect_fruit_slices.pdfIn PDF document text
    • http://kengoru.space/sara_bareilles_sittin_on_the_dock_of_the_bay_piano_sheet_musicm1zs4.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/hgjalMp/gadaw.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/backup_camera_app_for_android_phonejvhtb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377931/normal_6005f627555ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_600e6cc983d44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501962/normal_600fa063ee35d.pdfIn PDF document text
    • https://cdn.sqhk.co/vexagajezesa/mR5OEGn/15722390456.pdfIn PDF document text
    • http://vivadoctor.ru/11819652870zkgp2.pdfIn PDF document text
    • http://raifaisentgo.online/refezemenadalotz77dw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8b47343c-204f-4c84-afa2-4398a2791777/how_to_start_troy-bilt_snow_thrower.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_881688b1f9aa46f99b61c6b04327af14.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_50eeb6bc0bda4149a657cb76bbb140c1.pdf?index=trueIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_28def2b570ad4360ae3b495523f72d69.pdf?index=trueIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_574f2b3f2e0247ecb233cc46ffe9b20a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7375be45-512f-4194-80f3-550ed364b6d3/famakutabeba.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_29219f64f5c64adf96fd441742305e74.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
    • 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_off00028b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28B02 5400 bytes
SHA-256: 64b418ee8ea23617513b93eb3db8f3dd08655e4c2266ab2b7dd8494320f36e04
font_01_sfnt_off00029d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29D2E 3972 bytes
SHA-256: 2e691b474de20c21928f5f1264c97d35096c3b39efbbd3fb49c266f4d2f35232
font_02_sfnt_off0002acdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ACDB 15428 bytes
SHA-256: bf3a439f1f73feb6f47ff98bc44d315f3f6dff52d13a11ec208a108940153531
font_03_sfnt_off0002e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E13D 16736 bytes
SHA-256: beec997ffa1b6f439b48dcc34291cec6bd394b97fb8e4e07ad5690e36ed8a633
font_04_sfnt_off0002f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F885 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378