Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cc783e67376ced…

MALICIOUS

PDF

79.6 KB Created: 2021-05-24 20:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 683037274f90a6951870a58ac63870f9 SHA-1: 0a86469475b7573b173a482fbe285cc49109a7f3 SHA-256: 16cc783e67376ced12e99d5bea8b22b5286627ad75ae17affb79d0096d018dfd
156 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is zajinet.ru, which is likely used to redirect users to further malicious content. The ClamAV detection and ML classifier also strongly indicate maliciousness, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=does+a+keto+diet+lower+cholesterol PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454967/normal_5fcf202743328.pdfIn PDF document text
    • https://jegofedakosufe.weebly.com/uploads/1/3/5/3/135320490/wuwikipuvujodu.pdfIn PDF document text
    • https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/4745855c623da.pdfIn PDF document text
    • https://jetasiduneka.weebly.com/uploads/1/3/4/5/134586997/ropowopala.pdfIn PDF document text
    • https://repemokalit.weebly.com/uploads/1/3/1/8/131856723/mevumuvezakote_bebowekig_fulamarikexede_nulonifaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_605a7fc2a372c.pdfIn PDF document text
    • https://wuwifure.weebly.com/uploads/1/3/4/6/134647121/22a38c7554ed15d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417658/normal_600156c2d5bd6.pdfIn PDF document text
    • https://fewifaki.weebly.com/uploads/1/3/4/5/134578400/xabus-luririjup-mikutukeju-kezukolilirub.pdfIn PDF document text
    • https://viwobatenujaneg.weebly.com/uploads/1/3/4/4/134444739/vasamutuv.pdfIn PDF document text
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/giribaguvojo-gazezapaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495839/normal_604d682728433.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/jidixunonudoj_ruzezalemu_topijele_xeteramojanada.pdfIn PDF document text
    • https://wigewowatabosaz.weebly.com/uploads/1/3/4/3/134352056/2094225.pdfIn PDF document text
    • https://wunawewob.weebly.com/uploads/1/3/0/7/130775592/dawenadod-mevitunona-xaxodinunak-vevagomaxi.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/146afa8e-6834-47cc-8263-e967c9b97683/dejixo.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/42237617999.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/vaastav_movie_utorrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/160dfc8e-0fd6-401c-ad9c-bc697b931fa1/tomoweno.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/festool_portable_drill_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f7d499-f390-45b4-8972-1fa0643b7d08/fitbit_versa_lite_weather_app_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/31142855245.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 5180 bytes
SHA-256: 151cc2a286f67ea398077528225da7e123a04a19b299bb8eb7c5dcdfdbda38a6
font_01_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 10912 bytes
SHA-256: 9ed9f2762e034854647b5cc1244352a4c372600961c0f65215b314dbad328ca1

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