Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f37736fc20c723…

MALICIOUS

PDF

80.4 KB Created: 2021-04-08 13:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c75139e391802718575da7cf546cef2e SHA-1: 73b86732962f31ffd10a5248896368479eb86d99 SHA-256: 90f37736fc20c723cce282877a97059f83ae10b1926be1f5afa3295a58b3f7ab
156 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 SEO-optimized content, suggesting a link farm or content spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=what+is+vineland+adaptive+behavior+scales+used+for
    • http://inmyshtangen.xyz/690181225631w4gu.pdf
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/f4d98e.pdf
    • http://online-bestshop.xyz/where_d_you_go_bernadette_2019_online_sa_prevodomn4nru.pdf
    • http://instapriz24.online/arteriovenous_malformation_small_intestine_treatmentzrxpn.pdf
    • https://ludabasekid.weebly.com/uploads/1/3/2/7/132740342/5271422.pdf
    • http://tvoyoproc.fun/mi_smart_band_4_manuale_utente6cwjh.pdf
    • http://dujojiwasemob.mywebcommunity.org/14022710126.pdf
    • https://varigezizado.weebly.com/uploads/1/3/4/4/134480105/8186047.pdf
    • http://nudistoff.club/what_is_the_best_electric_brad_nailerlza2s.pdf
    • https://dolujete.weebly.com/uploads/1/3/4/6/134674842/labixoro-fapopej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/toniseligiwuzux/fibe_tv_guide_not_working.pdf
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_14f781ceaea5448f9c6348c1c35a28d8.pdf?index=true
    • http://xazopufegi.onlinewebshop.net/jesusesonujak.pdf
    • https://s3.amazonaws.com/napisakaluja/agilent_34461a_digital_multimeter_manual.pdf
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_ccef9b5b0b554e3cb046cd3f268ceaed.pdf?index=true
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_5fbe251d60514ecfa38a9b132e26eb9c.pdf?index=true
    • https://s3.amazonaws.com/kotidox/46433586226.pdf
    • https://f7927488-8152-43cb-a667-e231f58cc5c5.filesusr.com/ugd/950cc9_30e28dc09507479baa8aec93a9a3200f.pdf?index=true
    • https://s3.amazonaws.com/vosimalume/37756021104.pdf
    • https://s3.amazonaws.com/popisiburewixuj/free_empathy_map_template_ppt.pdf
    • https://s3.amazonaws.com/kaxukok/unir_dos_en_una_sola_hoja.pdf
    • https://s3.amazonaws.com/roxawo/dbx_286s_preamp_processor.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/zabuxipupomiweguwe.pdf
    • https://s3.amazonaws.com/bisute/98428778850.pdf
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_ef6474dbb1f04e2b8ebbcd6c747b3f0d.pdf?index=true
    • 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_off0000faf6.bin
513126b31500d9e9433a9f006ec1d3ec5a4a2b11d8b0021e15312b43e27215cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 5456 bytes
font_01_sfnt_off00010d88.bin
f95293eefa53561905e3c962c1d09fc1caed0d7f00558401bd712cef4eaca7aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 11048 bytes

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