Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf6c8703661c160…

MALICIOUS

PDF

76.0 KB Created: 2021-04-04 14:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e2b59902116ddb70f20acb47075234d2 SHA-1: eaea0ae9b6ffbccbbae7ecc6228218978f51a9f3 SHA-256: cdf6c8703661c1607834000dd241dd89c4707377882db3880430a5c9cd2f4ef4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards an attempt to redirect users to potentially malicious content, likely for SEO manipulation or to host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=the+silence+of+the+lambs+book+series PDF link annotation
    • https://rosotomana.weebly.com/uploads/1/3/4/5/134585450/27cc84f6135b0.pdfIn PDF document text
    • https://vivazezege.weebly.com/uploads/1/3/4/0/134041722/ratigititokavum.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/what_were_the_5_waves_in_the_5th_wave.pdfIn PDF document text
    • https://wakavofidokevi.weebly.com/uploads/1/3/2/6/132681750/fozeneponosoli.pdfIn PDF document text
    • https://wadamosemexijep.weebly.com/uploads/1/3/4/4/134434227/siwanatitifuji_lufasixigexoliw_bunepasow.pdfIn PDF document text
    • https://vewagabijepafin.weebly.com/uploads/1/3/5/3/135348553/1854057.pdfIn PDF document text
    • https://xoxatujetila.weebly.com/uploads/1/3/0/7/130775098/7938895.pdfIn PDF document text
    • https://gitazedekof.weebly.com/uploads/1/3/1/3/131398323/7b55bf6ca.pdfIn PDF document text
    • https://natuxebifenukud.weebly.com/uploads/1/3/1/3/131378868/puwawapida_sosabusuv_ladagifa_mapafile.pdfIn PDF document text
    • http://fuzabura.sportsontheweb.net/49221055818.pdfIn PDF document text
    • https://puxupukesif.weebly.com/uploads/1/3/0/8/130813524/wigotegujer-tosewu-serumimanos-bezobodirapure.pdfIn PDF document text
    • https://zewerigavuj.weebly.com/uploads/1/3/2/6/132681779/1438086.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_cc4df600f2d6443ca40680342c5e54f7.pdf?index=trueIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_3d1411f2215440f1b9fe3aa8e52738e2.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_40ba80c881d84dcd9fe7f8f0fce2918e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/39868782400.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/pikogifunijema.pdfIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_ce3153687af34e108e261d6582566e7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebisop/jidopurotug.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/ap_music_theory_student_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/active_release_technique_courses_cost.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_c9774b97b13d425d82e20035e8fde062.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_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 5276 bytes
SHA-256: 4b17dca0c8c370058456a2e1b73b371ace298e0d4e740bdf175255a855659e85
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 11376 bytes
SHA-256: a9acbd38c9033125dee8c64c67431f66da0b353ff951814543d07682674173f5

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