Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cba433d9f117dc5…

MALICIOUS

PDF

95.2 KB Created: 2021-03-13 17:30:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5302ed25fa6b6b38b0904daba89422ea SHA-1: 29dcfcaa775c06140254940ed081a55e0d6e8b20 SHA-256: 5cba433d9f117dc5c87c4c6d35b9283334896437b07368eca451c9f0520143e0
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/strik?utm_term=what+trees+do+spotted+lanternflies+not+eat PDF link annotation
    • http://white-x.fun/965635993737oi24.pdfIn PDF document text
    • https://dunawotota.weebly.com/uploads/1/3/1/4/131438316/pegunox.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/0a24b96b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_6029a5eea5f40.pdfIn PDF document text
    • http://kukushka.space/para_que_sirve_el_disipador_de_calornfa1d.pdfIn PDF document text
    • http://tk-pobeda.site/adobe_indesign_keyboard_shortcuts_cheat_sheet3ij9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fcaa617d0b38.pdfIn PDF document text
    • https://sadusanolomu.weebly.com/uploads/1/3/4/6/134646393/mixowiv.pdfIn PDF document text
    • http://cmb-eco.com/77955817402sgvv1.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/rujipelavo-xuwaput-filerovogelaz-sadebolunepupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_60279663533b7.pdfIn PDF document text
    • http://changely.club/surudedokosirademutamhxkte.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_c357fe63066a493787f7d77770f64936.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_c9541230e50247cf8567bcd423a55ea6.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_0f597573593c494cb64a1525864f65ec.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_d5ffe3d9572146d9929dd8e42811ff5e.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_7cd0cc80479b4a68a180a94a37c21dcd.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_fcb7e94c20f647029ed9d2315ca0e507.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_a6997373e1784cfbba9a0b38cc459b20.pdf?index=trueIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_d308baefb20e43119d41be740aa4219c.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_0bc583affa044f26a8ee535814c75097.pdf?index=trueIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_e88e4d465ce7448a9cbba72917dbcc55.pdf?index=trueIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_66e7a86aac354b35b851476f986d09ef.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13675 5144 bytes
SHA-256: b68b4ddac8acad627f94b084c0ed005c3816d986f05952066dcd93589dc1e299
font_01_sfnt_off000147f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F9 11776 bytes
SHA-256: 91369af6ae443b52b36839647abe037f9b3fdbad66b1ea96ad50f8e3f84b7c63