Malicious PDF — malware analysis report

Static analysis result for SHA-256 03aff27ad2fb783f…

MALICIOUS

PDF

70.1 KB Created: 2021-03-20 11:09:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3facc6d0b6de479afdeb364b69646335 SHA-1: 893805c332d0307f20e60f6ad59d772db459654c SHA-256: 03aff27ad2fb783f8c870b1a49dec0195c28572be18218210efd5728a2ca5cec
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external links, many of which point to SEO-optimized content or potentially malicious domains. The primary malicious URL identified is https://xajibur.ru/strik. The document body is heavily obfuscated and appears to be a lure related to technical information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=what+is+enthalpy+of+hydrogenation PDF link annotation
    • https://merasata.weebly.com/uploads/1/3/1/3/131378960/1256439.pdfIn PDF document text
    • https://kajabukege.weebly.com/uploads/1/3/1/3/131379037/900bc3.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/4f133ce2-865c-4eed-8dcd-b9f1681f1c65/how_to_fix_a_disc_drive_on_xbox_one.pdfIn PDF document text
    • http://sobajagas.rf.gd/29479448112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7424937-15dc-4218-89be-ece6c46c84fa/wesugel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20557dbf-e815-4d2b-8f87-95dafeda6849/how_to_get_all_endings_steins_gate.pdfIn PDF document text
    • http://lowuzoduveloga.epizy.com/24229402600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b22e43af-a2b9-4268-9046-08a132498a8a/2019_toyota_camry_hybrid_se_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15c771cc-4880-4490-bf51-aebcde42e6bd/republic_plato_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac84181-77c2-4af2-a725-9a61e13fe1a2/kezolajevamoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be8d382-ead5-4fbe-9963-96bfc20a5ac3/what_happens_to_the_high_sparrow_in_game_of_thrones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f0a2005-6a1d-4710-99a0-e7d74c153947/funes_el_memorioso_cuento_de_borges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f6afb3-6a00-42a8-bfe8-77b49e07ad7e/propane_auto_changeover_two-stage_regulator_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff7c6022-b7c9-4fa7-bee7-8579b70fbd4f/lirisikikozipisudirugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da5f46f-524d-42e6-8855-97541c02333a/besusivil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6e9295-180f-4198-9439-f3541d298a76/desktop_means_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73dfa3cc-94e5-4176-afa2-6720df0b2a9f/harry_potter_book_set_for_sale_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcba0c9c-c210-4bca-820b-192ea8a28960/who_created_the_5_canons_of_rhetoric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ec1991-fa5a-4fbc-bfd2-2cd05fbaa174/sagaxasixibezujow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/807ad165-f848-408e-9d84-e539fd5f54e2/ferrari_california_2020_price_in_uae.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_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 5420 bytes
SHA-256: 86e06e60cc4774db2667832ed8a24ebb49b8f6fc7c84f02acead6054036c9bde
font_01_sfnt_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 11584 bytes
SHA-256: f18e2569e9d398746d3a2e13533c4da8bb020c5b797ee81904d60e8fa7fea157

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