Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdfd8e2227c26bc…

MALICIOUS

PDF

102.4 KB Created: 2021-04-03 16:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 27e0c733409e418b69915ce81d6697b2 SHA-1: c08d02365290847ab2e8703a920e9dbf4916bb6b SHA-256: efdfd8e2227c26bc0e26330fa1df9e544f51368c200cfe43974793298dbfb686
96 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, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into downloading a malicious payload or visiting a phishing site. No scripts were extracted, but the presence of the external URI and the phishing detection strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=coefficient+of+variation+calculation+pdf PDF link annotation
    • https://cdn.sqhk.co/pabelemusib/gfjbuvL/37213760618.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/h7iahj7/dragon_ball_legends_tier_list_2020_march.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479710/normal_5ffebb83f14d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5fd6778ee3e75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_60155fc5d7568.pdfIn PDF document text
    • http://alifan.store/788802517972z8va.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_604b692cb9e22.pdfIn PDF document text
    • http://sqrab.top/guion_de_los_tres_cochinitoszoamb.pdfIn PDF document text
    • http://inmyshtangen.xyz/padubojasumudemexebip2gxf6.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisezepemu/jgZ4ges/soccer_star_2020_game_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bepukuba/lg_60uf7700_main_board.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/20307697298.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/salubofedunurarigezawede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/979ae510-16e4-44c5-855d-3cba7543ce04/top_self_propelled_lawn_mower_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/venerabu.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/android_studio_update_kotlin_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54409d57-720a-401a-8a1f-1184db7ee43c/nobojevivilaresux.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/marriage_anniversary_gif_video.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/pakistani_cotton_bed_sheets.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_off00013951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13951 4936 bytes
SHA-256: 9dedacae0371d14068845961bac294bd0b221b3f7aa916999e46cdf6badc61c7
font_01_sfnt_off00014a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A31 12888 bytes
SHA-256: b73c63f1fbd0f6ff7e32d4c1f826623c611918078c30f552f37754e51186a628
font_02_sfnt_off00017690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17690 16116 bytes
SHA-256: 5b94506d48fe70e34a624d6aec27ebfcfed7beaafd35557680db30745d8f0a4b

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