Malicious PDF — malware analysis report

Static analysis result for SHA-256 968a37a47c74dc62…

MALICIOUS

PDF

84.4 KB Created: 2021-04-05 06:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0842e84ee9805fd7922b259b26eb2699 SHA-1: dd08d1f7b143888637e83e7e2d6675cc32e5016d SHA-256: 968a37a47c74dc6268b786814a0bc4918a97472b04a9f6bca91463e61da48046
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs suggest the document is designed to redirect users to various potentially harmful websites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://seumenha.ru/wix?keyword=fallout+4+start+me+up+mod+xbox+one
    • http://jiwapadenejeza.getenjoyment.net/nexuwikuritalibami.pdf
    • http://gouliwer.online/cinemark_theatres_open8o153.pdf
    • https://bevufivob.weebly.com/uploads/1/3/4/6/134669401/vegewatajakezi.pdf
    • https://nujalujuxak.weebly.com/uploads/1/3/5/3/135347358/nanomuka.pdf
    • https://wesoxuzepa.weebly.com/uploads/1/3/4/3/134372623/4721038.pdf
    • http://pubgmobiie.com/cartoon_cat_skin_minecraft_pe1cys3.pdf
    • http://ketotreno.buzz/86087924714x8sod.pdf
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/9237000.pdf
    • https://mufogijagojar.weebly.com/uploads/1/3/1/0/131070489/bejage.pdf
    • http://opendouche.xyz/how_to_draw_a_face_step_by_stepjqrk3.pdf
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/xiruxesaxawageriloga.pdf
    • https://ridulimozujigo.weebly.com/uploads/1/3/4/1/134109280/25c77427a544.pdf
    • http://teenagetutor.net/bathymetry_data_free1hjhx.pdf
    • https://topigofifudonif.weebly.com/uploads/1/3/5/3/135304546/f9141c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tumuzu/27630570061.pdf
    • https://s3.amazonaws.com/jipowumat/alteryx_server_usage_report_error.pdf
    • https://s3.amazonaws.com/kumasala/3418388668.pdf
    • http://widifusi.myartsonline.com/rubepitaw.pdf
    • https://s3.amazonaws.com/retisovojor/how_to_build_time_capsule_subnautica.pdf
    • http://fojosotum.myartsonline.com/urolithiasis_pathophysiology.pdf
    • http://luzojora.atwebpages.com/famawinosilom.pdf
    • https://s3.amazonaws.com/xezonijida/john_grinder_richard_bandler.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bd8.bin
d6bb8721593fd1e1d5ebd9b16385afb2e92ff0034a2e545d174e00594d2256b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 5356 bytes
font_01_sfnt_off00011dfd.bin
b0fc57f3247e13f3191c0475aae44a4a88c97e70a662e97da3d458ac8177a32a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFD 10940 bytes

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