Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc01fa06a821d57…

MALICIOUS

PDF

82.9 KB Created: 2021-04-05 11:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 421857737145ee9afac665e4ba937ed8 SHA-1: c7d73e982cb41f1e114ee65f16b877e8a4a3fa26 SHA-256: cbc01fa06a821d5793628db9afb0953d0cf61b7c4a89a061fed1084e802f591d
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malware or phish users. The embedded URLs, such as 'https://baarspo.ru/strik?utm_term=infinix+note+4+price+in+ghana+jumia', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=infinix+note+4+price+in+ghana+jumia PDF link annotation
    • http://tipofeliluget.medianewsonline.com/aspartato_de_l_arginina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492529/normal_6005056ad6e74.pdfIn PDF document text
    • http://custits.space/dabexevevavokularabo2xq71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412379/normal_6041d2ad51cfa.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://dresdenpharma.ru/31084423952e8vua.pdfIn PDF document text
    • http://strapslap.online/what_did_the_pacific_railroad_act_of_1862_accomplishoxihr.pdfIn PDF document text
    • http://sisogelodaze.medianewsonline.com/marriage_counseling_questions_for_engaged_couples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_604207725addd.pdfIn PDF document text
    • http://voicebftyi.com/lieutenant_columbo_episodes_en_franckkn5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447278/normal_60411db31c88b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/221b1338-1cc1-4ef0-8e2c-df2b37590276/california_traffic_citations_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f0d6bf-e918-48bb-a8bd-2d3ec6cef6e0/99972666834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4d4591-3477-4db3-b57b-f7e9e8e2a384/essential_oils_desk_reference_3rd_edition_hardcover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef2c8202-dcaa-4586-ba7b-4dce12f26960/japarevuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fbf6010-ce4e-4079-9952-48ac69df2505/soroxavonazenerovafut.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_47aea315c70548438cab15b90c307eec.pdf?index=trueIn PDF document text
    • http://rabelinowizufe.myartsonline.com/susexomil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1347cb63-1023-4648-8f20-52468a87fabf/words_to_describe_cole_in_touching_spirit_bear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/785b1d44-bcf5-4354-900f-60dd6c55f01a/gutadevu.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_0820fa0975c1452c904c1b8f1661a950.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_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 5388 bytes
SHA-256: 348060b6b404ecc6dde1d3ee287e55ab23e5f314ada27d9267fca8c30a3b3f81
font_01_sfnt_off000118ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 11032 bytes
SHA-256: c34ff1c8c4cd2cdbcf00c51cf5b5f4c7fb60640462a1f49c622ce0c039ef3574