Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bf06130b474c26…

MALICIOUS

PDF

81.1 KB Created: 2021-03-19 05:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 62c0b427e44dcf94453e62356286ff3a SHA-1: 2cd211414f2a9cded8cc8b6425e05ce2bc121a65 SHA-256: 73bf06130b474c26e01f250611e3273c3be007972d0fac95d4f0feca0e70940b
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wix?keyword=king+kong+skull+island+movie+download+in+telugu PDF link annotation
    • http://sentytld.online/asus_mx279h_price_in_pakistanv47oc.pdfIn PDF document text
    • http://drnextact.xyz/sony_a3000_user_manualmilfp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_60244535d6a55.pdfIn PDF document text
    • http://wiinorama.space/bifeluzatixedelijinefhq41d.pdfIn PDF document text
    • https://tusopapa.weebly.com/uploads/1/3/2/7/132712380/mezupekirata-vodix-wusajaku-dowebuxemavenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_602e652097b6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449395/normal_601d88549aa00.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/lobevonodeg-zunupoze-rasisidufe.pdfIn PDF document text
    • https://lizoxezubim.weebly.com/uploads/1/3/0/7/130776499/3478.pdfIn PDF document text
    • http://reduslim-italy.site/football_heads_2014_unblocked_games49s2r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_2adf2678d8cf413999a2e845687a553f.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_7cc25c4f4752495aa57b770b6f063826.pdf?index=trueIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_82cf8f31f1db4e77b5950080f8c90da6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/883fe255-2e14-420b-9ed1-32f45487364d/mobekipowelududimam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57afdd8d-c1c3-4500-85e4-a6ccd1f35151/51044849441.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_a6260ff2b65f4ceb9e62a68b5c44a135.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3660d7e-c7d5-409c-9b7d-56f48b32fbe5/are_gun_raffles_legal_in_nc.pdfIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_96a0465d20f64d8db75896756db27638.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f0e038e-6cce-44f9-9596-95821daf01ea/48803860142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd5539b6-3a15-435c-9414-b5920aaa7743/gre_argument_essay_samples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb6aaab4-078d-44df-94bd-addef1d6ce17/tatalamarod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c712d314-94fd-4b06-b730-21af0096977a/how_to_put_a_hoover_windtunnel_back_together.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 5232 bytes
SHA-256: 3ff54f5c3e9ad18c4816509acbd258ea5dab9a0a8725698e990f304c2791ecfa
font_01_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 5236 bytes
SHA-256: 364159797ac1cc30e6a6651f210094f5bb9eb7e68d780532247d5901731801ff
font_02_sfnt_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 13088 bytes
SHA-256: 9f97c24afe8860e61f1e34b92cf33c6da485a627123663fc7b529a01f4c22ef9