Malicious PDF — malware analysis report

Static analysis result for SHA-256 f064f463eb43a56b…

MALICIOUS

PDF

90.6 KB Created: 2021-03-14 22:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b302eedc6007415b9b587e3bbc4e2c7 SHA-1: 7852e230a8a42bd01a6bf811c211338aa44ba7df SHA-256: f064f463eb43a56b8270ede28a37af9ffa51eedc99d06b18719921954de109d1
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains multiple embedded URLs, one of which, https://midufefew.ru/wix?keyword=spatial+pattern+speech, is directly associated with a heuristic firing for an external URI. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'spatial pattern speech' and mentions 'wkhtmltopdf', indicating it was likely generated by a tool rather than authored directly. The presence of embedded URLs and the phishing/trojan detection strongly suggest this PDF is used to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=spatial+pattern+speech
    • http://form-lnstagramcopyrightservices.com/36568405213aacr7.pdf
    • http://autoupgrade.website/libro_de_educacion_fisica_2_secundaria_2018vtob3.pdf
    • http://fb-ig-violation.com/75978876611lh5ln.pdf
    • http://closemaze.com/bd_army_admit_cardgujzx.pdf
    • https://static.s123-cdn-static.com/uploads/4378167/normal_5ff24ae033ef2.pdf
    • https://static.s123-cdn-static.com/uploads/4450507/normal_5fde6dc08944d.pdf
    • http://doordash.fun/aprender_ingles_americanovyahg.pdf
    • http://criticcxck.space/microsoft_project_2016_free_download_for_mach5mcp.pdf
    • http://profapp.pro/line_6_pod_x3_pro_for_salepms9n.pdf
    • http://prod-fruit.space/casio_ez-label_printer_kl-120_manualmdf24.pdf
    • https://static.s123-cdn-static.com/uploads/4370299/normal_600520c9d4b61.pdf
    • http://btsworld.org/the_gimp_user_manual_is_not_installed_in_your_languagevcno8.pdf
    • https://static.s123-cdn-static.com/uploads/4495043/normal_5fc7eef201800.pdf
    • http://am-sound.ru/76386552054ozqr1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zetituri/rujaniripu.pdf
    • https://s3.amazonaws.com/suxiweke/56605274779.pdf
    • https://s3.amazonaws.com/vukujidor/mickey_mouse_images_hd_png.pdf
    • https://s3.amazonaws.com/panalipolifod/economic_systems_exercises_worksheet_answer_key.pdf
    • https://s3.amazonaws.com/dudurat/27582923639.pdf
    • https://s3.amazonaws.com/xefezesebusu/74426094184.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110e4.bin
ac366b1b45d94c21c2463015ef4df28ec4a794f3a0082112bc891a422808f17a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110E4 5124 bytes
font_01_sfnt_off00012245.bin
c835edabd81681509f47f515e75c4ad42eac4100de7c6b16f44e9518b6221eb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 11012 bytes
font_02_sfnt_off000147cd.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147CD 16204 bytes

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