Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70c221b40bf9cda…

MALICIOUS

PDF

91.7 KB Created: 2021-05-23 09:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d561cc53d9bc891ad59d35681c3e63e8 SHA-1: 4b501916f63f55056deb0c244e9301a3badd756a SHA-256: e70c221b40bf9cda51a375f0ef73d02fcbcf10cf346c7e91eb473e862261afba
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing. The primary malicious URL, 'https://jacksth.ru/strik?utm_term=how+to+clear+memory+on+kroger+blood+pressure+machine', is likely intended to redirect users to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=how+to+clear+memory+on+kroger+blood+pressure+machine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459035/normal_60414bab29b59.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/sosidipijo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470977/normal_5ff38115c606a.pdfIn PDF document text
    • https://rexerobebaru.weebly.com/uploads/1/3/1/8/131872155/2545504.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5fc87f17e96d6.pdfIn PDF document text
    • https://rogubofiduga.weebly.com/uploads/1/3/1/0/131069879/wireresovotokeb_wevitu_tiruz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1bbdc97-da2a-4bd0-80f3-218efdb24e0e/how_to_make_a_technical_drawing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/823c2e73-6738-40c5-a519-5f88411ffad3/all_the_bright_places_movie_quotes_capacities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4168865-f0b4-4028-b31d-d9b294699e67/cute_heart_drawings_for_him.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9d95cd-ecb8-48e1-bf59-087f3b204c02/what_are_the_benefits_of_hydrogen_peroxide_therapy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18720b67-b26f-410c-91cd-fec147a004e4/basic_physics_concepts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a81fcb-7ed4-4886-8673-0199d56817f2/how_do_you_program_a_rca_remote_to_a_sanyo_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438ad113-523c-48aa-9a87-2a394eefabda/rodemuligikinubujubutuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a894a2fb-5a2f-488b-b4e0-18c77227c07b/dabenuwepitoxamilufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e55380-e3d0-4f06-be6f-eae4a276da5c/ti-nspire_cx_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff550fe-a534-4b98-adfd-d527531dd31b/how_to_fix_the_lid_switch_on_a_whirlpool_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/classical_music_for_babies_sleep.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/dog_sled_saga_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/how_long_does_nespresso_pods_last.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/zafitazexogepuwel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d05dad5-7943-44de-90d4-81a81095dd44/nys_dmv_road_test_evaluation_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/user_register_form_html_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11261 5848 bytes
SHA-256: e981d4f54f41dbbb238e1e468f083f341bff01b3c81bf9d0ffb23252671d2980
font_01_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 10968 bytes
SHA-256: ae4c5ace3c0e8cbf1e6e2ef66270842fe1aac61bc8d070842b9df3577817ad41
font_02_sfnt_off00014bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB0 16168 bytes
SHA-256: 794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8