Malicious PDF — malware analysis report

Static analysis result for SHA-256 592436678fa916d1…

MALICIOUS

PDF

108.0 KB Created: 2021-05-19 09:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c22b5a5b6f8ff2fed596782a20bdba5a SHA-1: 20665a3c4a843c6e8334606222349e8b694ec302 SHA-256: 592436678fa916d14157d3d6aef1dd052041767e585218e39420a09ebd25bec0
164 Risk Score

Malware Insights

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

The PDF file contains a lure related to downloading Nintendo DS ROMs, which is a common tactic for phishing or malware distribution. It embeds numerous external links, with a critical heuristic indicating a 'PDF_SEO_LINK_FARM' suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further confirm its malicious nature, pointing towards a phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/strik?utm_term=where+to+download+nintendo+ds+roms+reddit PDF link annotation
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/wufagijoxu.pdfIn PDF document text
    • https://rokajovata.weebly.com/uploads/1/3/4/3/134376264/6792957.pdfIn PDF document text
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/zonixojuv.pdfIn PDF document text
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/1921464.pdfIn PDF document text
    • http://jupizuginilumop.22web.org/gujividuvuzoriberepefe.pdfIn PDF document text
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/rebirazubexupasole.pdfIn PDF document text
    • https://rokosogamutoluf.weebly.com/uploads/1/3/0/8/130873735/2905881.pdfIn PDF document text
    • https://dekilaroturiti.weebly.com/uploads/1/3/1/8/131856809/lusozerabopoxix.pdfIn PDF document text
    • https://zafivagofe.weebly.com/uploads/1/3/6/0/136011523/5678703.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/debiwelof/culture_betsileo.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/snow_white_with_the_red_hair_zen_and_shirayuki_moments.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/how_to_put_logitech_k400_keyboard_in_pairing_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/jogeperanerimezekeke.pdfIn PDF document text
    • http://sedilar.rf.gd/python_list_functions_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/tasovew.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/66453034680.pdfIn PDF document text
    • http://wedalavunobuwe.rf.gd/bcp_business_continuity_plan.pdfIn PDF document text
    • http://didaledagaxuz.rf.gd/14446136862.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/ritezavosiruf.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_off0001691b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1691B 5172 bytes
SHA-256: fe6a12f4133652aae3a7ac024774624c9e138fa75e08978d609567bd52d3287c
font_01_sfnt_off00017a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A9B 11940 bytes
SHA-256: b9a3297e2dd3a6e69aa1d8d50d1609b8acef611454a12e3187feae6806e029a6

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