Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b4eb60cb23cf82…

MALICIOUS

PDF

79.8 KB Created: 2021-03-21 12:25:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 93c3ea3932dba3083eff5343bf8e43da SHA-1: 94e11bdda9d6dddb25c045bfc4783d7704009b2b SHA-256: 99b4eb60cb23cf82bae485e80d79459afb534440fb51705f6052b67176ec450f
186 Risk Score

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 0.9990

Heuristics 6

  • 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.
  • 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://baarspo.ru/wix?keyword=caldwell+wv+livestock+market+report PDF link annotation
    • http://zazorin.scienceontheweb.net/lg_v20_touch_screen_price_in_pakistan.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/guviju_lodapubuxamud_wosigax_dagim.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/YHVIQha/lukewibuxege.pdfIn PDF document text
    • https://xopusinad.weebly.com/uploads/1/3/1/4/131406491/5346036.pdfIn PDF document text
    • http://tikonazab.iblogger.org/how_to_induce_labour_sims_4_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/dekorasenu/fheOgjf/stickman_hook_2_cool_math_games.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/wusilevevolapamumid.pdfIn PDF document text
    • https://murarukaxew.weebly.com/uploads/1/3/4/6/134666391/rebiranekogo.pdfIn PDF document text
    • https://refefutetolesom.weebly.com/uploads/1/3/4/8/134868450/kojetu.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/zhfhaij/17275713842.pdfIn PDF document text
    • https://cdn.sqhk.co/vuramufef/ihQhg13/ducks_football_schedule_2020.pdfIn PDF document text
    • https://vatelepetelijul.weebly.com/uploads/1/3/4/7/134765631/moreduru-megavefek-gawaruvupemewax-faxekes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tawaxinazaka.rf.gd/wapowadixote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b27bdc-01f9-4a89-a8fe-b68ae351c9f0/solve_quadratic_equation_by_graphing_calculator.pdfIn PDF document text
    • http://tabizamasozelo.epizy.com/new_catholic_answer_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a2e0bb-0b68-41d2-b67e-efbcdc66000d/bonapid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e426358-7306-47ee-a1ac-80c71db974d1/spectra_s1_insurance_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67826de7-1ddd-4f08-b47e-a7506fa9046f/husqvarna_350bt_leaf_blower_review.pdfIn PDF document text
    • http://soxewimudinozuk.epizy.com/how_to_self_clean_a_wolf_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d70186c9-535e-4b8b-83ec-73bfc38229cc/bulitevegifokiketajovizov.pdfIn PDF document text
    • http://xanedemu.onlinewebshop.net/xuviwevore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43fdedd6-41de-4c92-926d-4aca6023eea0/panasonic_phone_model_kx-dt543.pdfIn PDF document text
    • http://davinawoguzag.atwebpages.com/the_spell_of_the_sensuous_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcaf22e0-ba18-409a-b05a-9ee4077ee8b6/exercices_de_comparaison_et_superlatif.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_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 5340 bytes
SHA-256: 2033b4dde0e66082212e0ba20d6fc70fa4c494341dd4676e592816e8eee2ddc3
font_01_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 10468 bytes
SHA-256: f16ea05d9babb963c6d2ce009b354e2369fad373982f1c3eaaf2f5910bd67043
font_02_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449