Malicious PDF — malware analysis report

Static analysis result for SHA-256 75da150601b9a49e…

MALICIOUS

PDF

79.0 KB Created: 2021-04-17 16:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ac9b9a2bb8fdbde39af8e256a8df40c1 SHA-1: a963f118dffe9e5ab02c6463f02bdd939326155a SHA-256: 75da150601b9a49e17da66a3ae8c7223b3f541bad3d6256c90261c7222971901
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://golowaki.ru/strik?utm_term=what+is+chemical+energy+stored+in PDF link annotation
    • http://xodesat.22web.org/62579099174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484093/normal_6044d157bea50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402501/normal_5fe74e787379a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_602c58a4c1f2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455179/normal_604826307a02f.pdfIn PDF document text
    • http://glasshookahcatering.com/18381533219h0lf6.pdfIn PDF document text
    • http://avtovishki-msk.ru/service_business_income_statement_template66wt9.pdfIn PDF document text
    • http://detonic-italy.website/vozikebidawpe3ly.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/cloudflare_outage_blog3h4kq.pdfIn PDF document text
    • http://bazis-rostov.com/domino_smash_mod_apkii2pq.pdfIn PDF document text
    • http://shop50off.info/29528712791qhd6o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rofixalo.epizy.com/75841205544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42197786-68ac-407b-a43d-e1cdd1136cde/very_sad_life_quotes_images_for_whatsapp_dp.pdfIn PDF document text
    • http://xamawesurasido.epizy.com/dometic_rm2551_not_cooling.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/68755673836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c751be2-0e72-4c2f-ba2f-5ae082b59829/miniature_dachshund_puppies_md.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/theme_of_poem_anthem_for_doomed_youth.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/41106313919.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/etika_menggunakan_media_sosial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f07ba4a-2a4f-4aef-9a4f-e877933e50a8/vegan_diet_plan_for_weight_loss_in_hindi.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_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 5468 bytes
SHA-256: 5fc7555cef6a2ecbf9b0d1738a4f95c5c73fc901346ec74e3adcf9cbf5c14c3b
font_01_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 11440 bytes
SHA-256: 24a0f00a7a87c54a3bd8feb71418193dfc7c87c0e60975d665f8b9f04b885ea7

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