Malicious PDF — malware analysis report

Static analysis result for SHA-256 8247c2a969b33c4d…

MALICIOUS

PDF

125.0 KB Created: 2021-04-12 00:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6daecdd4aa4a90265f1d71245e4ea1f8 SHA-1: 17c4dc16758fa960d98b9e6c249f74f2736a041f SHA-256: 8247c2a969b33c4d894fb0b4959c8adaa362ea1adddca5eb9c4d41b2228b6ee7
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with a primary focus on directing users to `resalured.ru`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` suggests the PDF is designed to host many links on disposable domains, likely to obscure the true malicious destination and evade detection. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://resalured.ru/strik?utm_term=1+to+1000+numbers+chart+copy+and+paste PDF link annotation
    • http://lezigovedavide.getenjoyment.net/attalea_speciosa.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/xovonubigimabaruwimeduwew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_6056b884f0329.pdfIn PDF document text
    • http://rawenspant.online/can_a_16_year_old_date_a_19_year_old_in_colorado5ij4m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_5feaf0df56b93.pdfIn PDF document text
    • http://reassurez-moi-fr.info/new_call_of_duty_ps4_argoseu1g8.pdfIn PDF document text
    • http://molefomisapeput.mypressonline.com/rakerisojagufajabixokusa.pdfIn PDF document text
    • http://vazewuxu.mywebcommunity.org/30535256552.pdfIn PDF document text
    • http://witaxolexigabi.mywebcommunity.org/wemariba.pdfIn PDF document text
    • http://zutelotojenexop.getenjoyment.net/my_favourite_animal_cat_essay_for_class_1.pdfIn PDF document text
    • http://moscow-siberian-force.online/jamey_aebersold_blues_in_all_keys4s735.pdfIn PDF document text
    • http://shoop-fm.ru/52876409133h0548.pdfIn PDF document text
    • http://nupifijaw.getenjoyment.net/alphabet_arabe_gratuit.pdfIn PDF document text
    • http://xanejog.medianewsonline.com/hasil_amandemen_uud_1945.pdfIn PDF document text
    • http://hellesypakk.online/920778014062y92q.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/e2f2919d-c212-4329-a3f7-ed9d5666fe2f/sirezowifetelibej.pdfIn PDF document text
    • http://zapusov.atwebpages.com/71352477205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f878e9-e862-4955-ab20-deda9eb00d37/boweberane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3493556-34db-413d-a586-043e61dfc0d4/macbeth_act_2_quotes_and_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc06734-3673-424e-afa3-44ed8b139fe8/sacred_geometry_pattern_tattoo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a83b01-851e-43c3-9592-027cec58f013/what_is_a_career_in_data_science_like.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b30d12b-1f75-48f4-af8b-c4e55e5607c8/zarokanez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b16d8e-484e-40c2-af6c-ef50606c160c/dabosijukasafine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55cc658-21ec-4721-928e-a6700a83d4c5/streaming_fifty_shades_of_grey_2018_full_movie_sub_indo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a47507f-c44c-4288-89bc-f60fb99ab5cc/kyocera_ecosys_m5521cdw_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f0b930-61b2-4d54-bf55-eaa2cdb9ce0d/red_hot_itchy_spot_on_leg.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_off000186e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186E6 5620 bytes
SHA-256: 7e1285515afc4a74572e5486315ce69d550ce2a7270cdcecd3af4913bf8ac63a
font_01_sfnt_off000199d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199D8 15524 bytes
SHA-256: 34a755b61d3e2ed5b9e744056951ac7acbd9b5322e4d014b6e566cd95c9e0cec
font_02_sfnt_off0001cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD39 16904 bytes
SHA-256: 9eb5cbf406d1795970d1e8dc15cad4fb21c77a9a5169f2b984750d5a3f857359

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