Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf2337164d0cd6c…

MALICIOUS

PDF

97.6 KB Created: 2021-02-02 20:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2f07549effe50bcafd8d4260edb6b111 SHA-1: e63c6cc5d8c703c32e85b7311737705ad68b2c7e SHA-256: bbf2337164d0cd6c87f43518330b6121e7b91db11ba8103ede57d910a3195191
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links to disposable domains, a technique commonly used for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs and the heuristic firings point towards a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/123?utm_term=mathematical+curves+and+their+equations PDF link annotation
    • http://fdvsefwfrw.space/84mer.pdfIn PDF document text
    • https://pafufido.weebly.com/uploads/1/3/1/4/131407890/digilogizew-zekumiw.pdfIn PDF document text
    • https://linajijokib.weebly.com/uploads/1/3/4/0/134000065/supijidoji.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/00fa4173dbd.pdfIn PDF document text
    • http://winoorama.space/sketch_draw_and_paint_sony_mobilenmovx.pdfIn PDF document text
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/sodogojiwip_gurobotusiwu_legivasixi_tewumexefeman.pdfIn PDF document text
    • http://damita.fun/internal_audit_schedule_template_iso_9001r66hp.pdfIn PDF document text
    • http://zipujesilan.22web.org/tuxaxosiposik.pdfIn PDF document text
    • http://yogist.fun/fundamentals_of_management_ricky_w_gap4p2.pdfIn PDF document text
    • http://giocodigital.website/lb_in2_to_lb_ft2uzxkt.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/369ca7ea49c5f9.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/winumigutam/jugen.pdfIn PDF document text
    • http://dowinoxerirud.epizy.com/glioblastoma_multiforme_pathologyoutlines.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/23889078004.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/acls_2017_espaol_descargar_gratis.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_off000123ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 5372 bytes
SHA-256: 23f6255359f53b77758525681c1720b5d2fb24fc6c6ed14921cfb75e018805ea
font_01_sfnt_off00013613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13613 14336 bytes
SHA-256: acb2d5d32c54bf777c12393e775c18d231c0d74fc02f868b7ea75ad26e86fc69
font_02_sfnt_off0001640f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1640F 16072 bytes
SHA-256: 062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1

Open this report in the interactive analyzer, or submit your own file for analysis.