Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40bd9028f879edb…

MALICIOUS

PDF

88.8 KB Created: 2021-03-28 21:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1639428d1f576164728f4f7d0338229d SHA-1: 5c7f034a1877b19f4631f5af9c8749406a100602 SHA-256: d40bd9028f879edbd74a463a612c2a5ab6aff135723397fbc0d13e4f3ed97cd4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains, a common tactic for SEO manipulation or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these linked documents. Although no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's part of a larger malicious infrastructure.

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://botokaw.ru/strik?utm_term=the+art+of+exceptional+living PDF link annotation
    • http://fishing-rods2.club/gibarutebejitijevejawhn61s.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/fHbMQbA/you_like_my_tank.pdfIn PDF document text
    • https://cdn.sqhk.co/mofisozulud/ijjbhbK/54321946033.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384652/normal_5febcc4b58b5a.pdfIn PDF document text
    • https://xitititoludazo.weebly.com/uploads/1/3/5/9/135987602/2307961.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/dhfjijg/cbq_diners_club_card_benefits.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/how_to_drain_a_keurig_2.038pt6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369327/normal_5fcbce3abf3e7.pdfIn PDF document text
    • http://polfact.site/82289278667iq8hv.pdfIn PDF document text
    • http://lishop.site/dezamagudagodawukiybft.pdfIn PDF document text
    • https://cdn.sqhk.co/xokipuxat/augcieA/logo_quiz_answers_level_302.pdfIn PDF document text
    • http://bukawavado.medianewsonline.com/luzotuvulobeburukewififu.pdfIn PDF document text
    • http://tokiridevifo.medianewsonline.com/blood_cancer_positive_report.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/how_to_set_up_screen_mirroring_on_vizio_smart_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/66EoheU/buwixo.pdfIn PDF document text
    • https://cdn.sqhk.co/wisivelu/GifibHz/sesavegesivotamidaraza.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/jcjZAji/dudovajazos.pdfIn PDF document text
    • http://werikipirojenob.scienceontheweb.net/ortopedia_e_traumatologia_hebert.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/746133.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitasixan.atwebpages.com/how_to_calibrate_samsung_plasma_tv_power_supply.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 5176 bytes
SHA-256: 3182d4eeb8356dc7f628169109cdf9c8c2af545cacd025cbc1c8af6e7af28cbd
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 3408 bytes
SHA-256: 20061314b9238a4592b331ddff17dd2c9ac3296a2dae352f4f3c71d986e390cc
font_02_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 10840 bytes
SHA-256: 54394a2a97fac09dfe5d6651dafdfe36ed6c8bfb6536bd762ecc2ec70b19918b
font_03_sfnt_off00013ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC8 16628 bytes
SHA-256: 4638a5fdf36364d780f4349e24c0c9be83728015a7bbe9c532e2045e82e661f9