Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e5b28c4e883a8f…

MALICIOUS

PDF

76.8 KB Created: 2021-05-04 06:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 52f17b65c216e5f509dab7187fb35dd5 SHA-1: 116199f1132410450676553b13c8c805bed17e3d SHA-256: c4e5b28c4e883a8fc5b107bbc5483b21bf4c2ed9357e5f29b5af78001b8458fb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=list+of+linking+words+in+english+language PDF link annotation
    • http://kmplitka.shop/sitevaxivadebawapafipkccvx.pdfIn PDF document text
    • http://50offshop.info/ingenuity_swing_and_rocker_batteries71asy.pdfIn PDF document text
    • https://cdn.sqhk.co/ragebobeb/hbjeha1/camera_studio_mod_mcpe.pdfIn PDF document text
    • https://cdn.sqhk.co/dibigawila/pgjghZt/89095108532.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/hGhi0gi/90955008989.pdfIn PDF document text
    • https://cdn.sqhk.co/bepigulusibe/Z5SQjhB/bunny_popcorn_mix.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/hjMhihc/baritur.pdfIn PDF document text
    • https://cdn.sqhk.co/sitosuduf/njhkgjL/auditor_appointment_form_mca.pdfIn PDF document text
    • https://cdn.sqhk.co/wubofuse/N4jeifU/amortising_formation_costs.pdfIn PDF document text
    • http://igafnd.org/38598013897xmeu5.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/litunux/how_to_use_bokeh_effect_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb9c2ed-830d-41e7-9b44-432e84a48827/how_to_improve_soccer_skills_at_home.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/chemistry_mole_problems_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c9e9ae-94f0-4be2-a2e9-810f94390464/leadership_theory_and_practice_7th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15f9422-668c-47ea-ac5e-0c1344f34634/plantronics_voyager_6200_replacement_earbuds.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/imagenes_del_sistema_muscular_humano_y_sus_partes.pdfIn PDF document text
    • https://165abacb-5525-4e66-971c-c167d859e756.filesusr.com/ugd/f3f2a5_4a9b1c1b61594ad1b788afeebefeae8b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/tracfone_-_lg_rebel_4_lte_with_16gb.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_7281c98cab364d898f01e514d8ad5a19.pdf?index=trueIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_7d87a1211b6847e1800457bd1a7dc53a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benuka/vufusulugadoluk.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_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 5268 bytes
SHA-256: d5b8af6b5a1a8faf1531fcbc3d084e8ac4a8d8ac267e37a134e11c4b0429d268
font_01_sfnt_off0001023e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 10400 bytes
SHA-256: e90e3b5a2675c2322f311139adce5c9d13569d9a3515ca0ef0b91bfa2e67e913

Open this report in the interactive analyzer, or submit your own file for analysis.