Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db648e78681261e…

MALICIOUS

PDF

72.6 KB Created: 2021-05-04 08:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7c755bbaf7444c52e300773eafe1db8f SHA-1: edb4a32591989fce77ccea7e6c114891aa6bfb28 SHA-256: 4db648e78681261e0150aa5a1dde6140d48b77d7485c474f76d7ef80da02ea71
194 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many pointing to disposable hosting, designed to obscure the ultimate malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' lure further supports a deceptive user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/strik?utm_term=power+electronics+md+singh+kb+khanchandani+pdf+free+download PDF link annotation
    • http://blacklaser.ru/lezobejekonurabixipskx2s.pdfIn PDF document text
    • https://vipegiwofavagob.weebly.com/uploads/1/3/5/3/135302795/f243e.pdfIn PDF document text
    • https://pomorewosijimop.weebly.com/uploads/1/3/2/6/132681296/guzur.pdfIn PDF document text
    • http://kyukty68.xyz/xujaji3dni.pdfIn PDF document text
    • https://pumijisiror.weebly.com/uploads/1/3/1/3/131381241/wodarexit_lusagixowusu_zunom.pdfIn PDF document text
    • http://netzamka.ru/nx_reverse_engineeringz9icp.pdfIn PDF document text
    • http://filmera.ru/why_is_my_arrow_keys_not_workingbe21m.pdfIn PDF document text
    • http://gifawel.22web.org/goong_ost_violin_sheet_music.pdfIn PDF document text
    • http://housefashion.ru/94093636910osgtr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_74442e515ab546d5a9f557f631824413.pdf?index=trueIn PDF document text
    • https://869e45c2-9c2d-410b-ad52-4d3411d41339.filesusr.com/ugd/73bd41_bf8a4cd2bb6442c586e27fe62740d4cb.pdf?index=trueIn PDF document text
    • http://zezevefo.rf.gd/imf_bentham_limited_annual_report_2018.pdfIn PDF document text
    • http://dejamatokato.rf.gd/atoms_and_molecules_class_9_questions_and_answers.pdfIn PDF document text
    • http://jowurixidab.rf.gd/32614368185.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_4d46746b39c043c382ece8d98bd86d6b.pdf?index=trueIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_31831bb404794ef1b49251c699a8500b.pdf?index=trueIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_1a29a2cbce854d309bf4ae4c43b83b90.pdf?index=trueIn PDF document text
    • http://boribasumagit.epizy.com/all_bhakti_image_hd.pdfIn PDF document text
    • http://veguxakafopuvix.epizy.com/wonotorevujelonebib.pdfIn PDF document text
    • http://savakaxokajudik.rf.gd/builders_brochure_design.pdfIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_ace8b8f4bd5f4721a8d6d9b5d53f223b.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_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 5868 bytes
SHA-256: dad09c183474df4e922f89af9f5b304715dab685ee139b1837fcccbda668ef56
font_01_sfnt_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 10832 bytes
SHA-256: 1ce243a6cc3e4dd30c51c01bccba5f976838a38f6393ade1ea86748459e85c74