Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a7fb3142c3ff37…

MALICIOUS

PDF

53.6 KB Created: 2021-02-10 18:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fa63dd9d46004e001f9d1246ae45224a SHA-1: ef2bf04bc68d726cb0e8c1c7444361b8184f72b9 SHA-256: b3a7fb3142c3ff37ebd869c7511be32dc5c8051c5155a12c19cc33287163254e
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8241

Heuristics 4

  • 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 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
  • 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/aws?utm_term=2017+chevrolet+sonic+owner%2527+s+manual PDF link annotation
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/vivasepobikuboguwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421970/normal_60054be87b07e.pdfIn PDF document text
    • https://pezawixutumef.weebly.com/uploads/1/3/1/1/131164564/b1e8cb7aa611.pdfIn PDF document text
    • http://zeraseb.66ghz.com/likedizivimelivafun.pdfIn PDF document text
    • http://xajozixav.iblogger.org/38304733308.pdfIn PDF document text
    • http://zinuvudoliku.iblogger.org/treatment_of_iron_deficiency_anemia.pdfIn PDF document text
    • https://valisuzikejuxeg.weebly.com/uploads/1/3/4/0/134017117/sozew.pdfIn PDF document text
    • http://dekagexagupeje.iblogger.org/formalits_cession_de_parts_sci.pdfIn PDF document text
    • http://zarozub.iblogger.org/44093845469.pdfIn PDF document text
    • http://nowefewafugaki.iblogger.org/antivirusni_program_kaspersky_free.pdfIn PDF document text
    • http://gijixig.22web.org/conjunction_worksheets_for_first_graders.pdfIn PDF document text
    • https://tevoletefe.weebly.com/uploads/1/3/1/6/131606261/bomamoviwunakejefogo.pdfIn PDF document text
    • https://dexejajakoto.weebly.com/uploads/1/3/0/7/130739268/f07dbd8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kezakixekinefa.rf.gd/gubijo.pdfIn PDF document text
    • http://ketavulamuxi.epizy.com/informant_listed_on_death_certificate.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/chale_aana_status_wapmight.pdfIn PDF document text
    • http://rebobimakefeli.epizy.com/jiinju_bubble_sheet_mask_review.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/manualidades_de_otoo_para_hacer_con_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/fimesoligulevofa.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/blackpink_in_your_area_dvd.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06C 5536 bytes
SHA-256: 20c98df6220343ddfb06eeac7f4898e94a379c77e15f7bd1ce1259ab7fd2c3ca