Malicious PDF — malware analysis report

Static analysis result for SHA-256 782ee8f386c24e44…

MALICIOUS

PDF

78.7 KB Created: 2021-03-14 15:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e98e946dec12899a0c3c685bd8e67c39 SHA-1: 4e4b278f7636123280db7418d4e062f2d9249b23 SHA-256: 782ee8f386c24e441b0745fb2b70a2613a84b05e19a253d4cea54e78bad2b52c
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • 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://resalured.ru/123?utm_term=hiragana+writing+sheets PDF link annotation
    • http://mrshadow.net/6204862098403frk.pdfIn PDF document text
    • http://basiditdcf.space/old_school_pizza_menu_st_thomasyyl06.pdfIn PDF document text
    • https://cdn.sqhk.co/rogevuzazi/6a5gcgc/sing_karaoke_online_and_get_a_score.pdfIn PDF document text
    • http://alcexpress1.xyz/cuales_son_las_causas_de_vertigo9q9vz.pdfIn PDF document text
    • http://card2card-perevod24.site/93953420107c1j52.pdfIn PDF document text
    • http://tipografiyav.moscow/singapore_math_textbookg20uj.pdfIn PDF document text
    • http://creditscorehelp.info/panukupar5v7e.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/zgeON8e/sepasejegigifudeme.pdfIn PDF document text
    • http://itash.space/47604247660jjs1s.pdfIn PDF document text
    • http://moneymaya.site/41017978428mqvdw.pdfIn PDF document text
    • http://uk-delfin.ru/what_is_a_nuclear_studytnxjp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_24aba0d86cb1470a95ebde42369d75c1.pdf?index=trueIn PDF document text
    • https://e064a861-6c7b-46af-b67a-66be1f32d776.filesusr.com/ugd/ec3e4b_39c7a60934d9400185d64e1df41bf854.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_dde7b1142695476ba52549975d216ceb.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_bb344678ed1c41e3a2acf50a439b2498.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_384f9f3eee6044618a7906c3f7ef6838.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 6824 bytes
SHA-256: 6669b3316a10113eb7b0cead3da9afd4b4a0d515a35535806e8bf72c99612899
font_01_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 4968 bytes
SHA-256: 35d9a2194263e30c9f7a7605ad49c562fd5fdbe392c7dfffe4fd6639032e2793
font_02_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 10760 bytes
SHA-256: da3c03c4d1f74005c2830c90f0b397927d7a6b060395b3ae20fafa462e7f909c

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