Malicious PDF — malware analysis report

Static analysis result for SHA-256 f046ab8fb005f1cf…

MALICIOUS

PDF

99.4 KB Created: 2021-04-09 00:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e14ba36c6293fe6cf071a87fac7bd025 SHA-1: fcd2a0f345e786677505574d2358067f22d64cff SHA-256: f046ab8fb005f1cff42155df1336701afffb8ac6ac3440a9228801d6a5f5dfe4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO scam. The primary URL, https://xezojetit.ru/strik, is likely part of this scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document likely serving as a lure to redirect users to malicious or scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/strik?utm_term=what+is+the+oxidation+state+of+cl+in+cl2o PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5fdb984f7edb5.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/1835aa7fe6ac.pdfIn PDF document text
    • https://xikodixugab.weebly.com/uploads/1/3/4/7/134707070/tepul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381541/normal_5ffab10dcde66.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/9062568.pdfIn PDF document text
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/fea35b4dc308.pdfIn PDF document text
    • https://rowozone.weebly.com/uploads/1/3/2/7/132740293/jijidu_sogij_lexabo_felijefalaledo.pdfIn PDF document text
    • https://cdn.sqhk.co/guwezasov/fQOijy4/90194619406.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/Z9jfFhf/azamara_club_cruises_uk.pdfIn PDF document text
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/3830779.pdfIn PDF document text
    • https://bapanezuginu.weebly.com/uploads/1/3/5/3/135310050/vuluwukevezetoke.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoverol/jdie4qL/why_is_my_android_internet_running_slow.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/limezawap_kuvapur_surovelekosex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403938/normal_6009057e1f05e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_09317d6f821d4d22aa6f848cdef8bce5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4cd2945-0378-4dd1-bbdf-6bc5718ada36/54220461252.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_365d4c42b775448c911686182e834a37.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_277be6a51ca84796b071ab9447fa4644.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d9d2698-800c-4cdc-9446-6ce77bf7e8f4/kegutaruluw.pdfIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_310e386e5d194d728c656fa8c1a95866.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 5224 bytes
SHA-256: ef4ea01fe635c63a69094bd2a717644328bc04182b37d33864724909e4676bc1
font_01_sfnt_off00013136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13136 12308 bytes
SHA-256: ba9aa5bfb2ce5c647234af0db58574667f92b6cce849ba06d4b06d5aa17d1a57
font_02_sfnt_off00015b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B24 16220 bytes
SHA-256: b1dc4b9f9802e69dbaa7c758e22e4c2074a87408d2be0b97c2c861e6f81bc16e
font_03_sfnt_off00017080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17080 6072 bytes
SHA-256: 7172655a77fbaab9fb06f650a757a52655d06d232b477baef18bd8b9928a7e7a

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