Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc9857ac85f7bdb…

MALICIOUS

PDF

75.9 KB Created: 2021-02-05 21:38:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9ce907492bdd55977b0078daa65820ae SHA-1: 749a101903dc1a5e15c0243bc1ca2d3c949e4c60 SHA-256: 6bc9857ac85f7bdb2a8168dedd7413357049b0f552eac42826ed899af25032d5
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for brand-impersonation credential phishing targeting Amazon. The document contains numerous external links, with one pointing to a redirector hosted on weebly.com, which is likely part of a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jomigivava.weebly.com/uploads/1/3/5/3/135330213/timebiranebop.pdf.
  • 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://druttle.ru/aws?utm_term=amazon+carding+method+pdf PDF link annotation
    • https://jomigivava.weebly.com/uploads/1/3/5/3/135330213/timebiranebop.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/XjdcgjG/wuzimiza.pdfIn PDF document text
    • https://cdn.sqhk.co/sasibasodiwu/ihmJjd8/24671173626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_5fd380c79ab7f.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/hYjh9hh/soundset_metro_transit.pdfIn PDF document text
    • https://sigesibum.weebly.com/uploads/1/3/1/4/131438142/mapiseferubovu.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/jcuFYCC/control_pro_250m_airless.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/agiidlQ/59005314283.pdfIn PDF document text
    • https://sulasaboxa.weebly.com/uploads/1/3/4/7/134767053/7feb1e0.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/R1rgggc/88453702171.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tomaxade/alpha_bravo_charlie_episode_9_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/horizontes_script_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/master_thesis_proposal_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/composite_materials_by_kk_chawla.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/weekly_calendar_schedule_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/professional_civil_engineer_cv_template.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/32125192610.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_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 5400 bytes
SHA-256: df7e8512d9dad668ad26308c7ef8f68c344683d44e4779d52f03437135d2c2a7
font_01_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 11476 bytes
SHA-256: 664339a5ac32ba13c2dd7a42868d09f327897e7c50051349719b6dfc97660886

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