Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73e2a7a07a7a5c6…

MALICIOUS

PDF

73.9 KB Created: 2021-02-01 20:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e3c501d479fb08a8550bcbd49571ae60 SHA-1: 70666ff5a28df99dedc55c10dd4600801373cd75 SHA-256: e73e2a7a07a7a5c646d6ed3579ef8f1b3edf5f5f9545a842ca1c23dc9885bbc6
184 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the numerous embedded URLs point to disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/123?utm_term=disney+songs+guitar+tabs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424666/normal_5fd1fe8c56ee1.pdfIn PDF document text
    • http://apple-fruit.space/anatomy_3300_ohio_state8lu9u.pdfIn PDF document text
    • https://xafudilolara.weebly.com/uploads/1/3/4/7/134744509/dediwolojotekatul.pdfIn PDF document text
    • http://xtreme-sport.ru/vocabulario_frances_b1repdr.pdfIn PDF document text
    • http://zoo-taxi.site/5633810935k8gz7.pdfIn PDF document text
    • http://hayatevesigar.online/excel_2013_formulas_john_walkenbach0v5j5.pdfIn PDF document text
    • http://static-start.top/infinity_war_game_download2673x.pdfIn PDF document text
    • http://santand-es.com/90904206359kgrcm.pdfIn PDF document text
    • http://originalhallyu.com/pipikozulujosuredizituguz5e2ia.pdfIn PDF document text
    • http://successinyourlif.website/exploring_physical_anthropology_a_lab_manual_and_workbook_answersnzqx6.pdfIn PDF document text
    • http://foodguideblog.com/drake_straight_up_to_my_face_mp3_downloadugvtm.pdfIn PDF document text
    • http://prazdnikprosto.ru/aplikasi_codashop_mod3j526.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/guxolububan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461481/normal_600013e0a71a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471474/normal_600808eb4028c.pdfIn PDF document text
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/b4eece.pdfIn PDF document text
    • https://latapelubatute.weebly.com/uploads/1/3/5/9/135960370/kugabuwisamuv.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/sulasatevirexo/72377077094.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/video_editing_software_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/hungry_shark_world_obb_file_apk.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_off0000e411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 5064 bytes
SHA-256: 96b738ea37e403e52c208f67a9cf5147d865baa52007e318cad331904b48dc1b
font_01_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 10816 bytes
SHA-256: ed314fa120f1541d6ba6233e2c1de38d08cc389d2d679197ef3883f01578ed27

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