Malicious PDF — malware analysis report

Static analysis result for SHA-256 376e6c87ce8121a4…

MALICIOUS

PDF

94.8 KB Created: 2021-04-05 16:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 29804c62149750de8db9de70a9a6f903 SHA-1: ca2048009f617afa9fdb7df6a9bdf6172321e87a SHA-256: 376e6c87ce8121a4178bcafef9b9cb027d03b98fbfe37305e702284ee22b8bea
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to 'https://xajibur.ru/wix?keyword=a+single+shard+chapter+1+pdf', which is likely used to redirect the user to a phishing or malware hosting site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to host disposable content, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://xajibur.ru/wix?keyword=a+single+shard+chapter+1+pdf PDF link annotation
    • http://about-fb-support.com/77796954190t38w2.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/balance_of_trade_of_pakistan.pdfIn PDF document text
    • http://jorodija.iblogger.org/9289413617.pdfIn PDF document text
    • http://copyrightsupport-ig.com/40971387189hn67u.pdfIn PDF document text
    • http://aromaita.space/lee_load_all_2_bushing_chartkcmk0.pdfIn PDF document text
    • http://stankovit.ru/chapter_2_the_planting_of_english_america_packet_answersxb747.pdfIn PDF document text
    • http://motowifenizemuz.22web.org/47242158781.pdfIn PDF document text
    • http://dvestideyli.xyz/wuposiluwixad8rsv.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/ba567172-5592-4530-98f9-66fef3ff0507/whirlpool_cabrio_dryer_f1_code.pdfIn PDF document text
    • http://pekowob.onlinewebshop.net/architectural_thesis_book.pdfIn PDF document text
    • http://duwemanuwixam.atwebpages.com/alfa_laval_purifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafc634f-8b28-46af-a087-0320158d9591/nugalixumuvuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d59603a-5abd-4f6f-bc0f-86fa9373d999/command_prompt_commands_map_network_drive.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/25977066540.pdfIn PDF document text
    • http://delisomujiroma.epizy.com/powerpoint_org_chart_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8accaa99-2271-457d-bb00-0c5fb03c6578/forex_tutorial_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/76330311022.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/fesotupuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7b2e28-a1cc-4c99-8c69-0023607581d0/donkey_kong_country_returns_ign_walkthrough.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/gopro_hero_3_default_password.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/first_alert_p1210eaus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e12e0c1-8e31-474e-bc58-f5c5bfb51dfb/karulogunisobexiwexamada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6bc3f8e-7fca-4cb2-8d57-ffb26b7107b0/what_is_the_primary_objective_of_canadian_healthcare_policy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab54ca51-b6d8-43d9-8339-4a02d2c1c3dc/fujifilm_finepix_s1500_best_settings.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_off000138ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EA 5456 bytes
SHA-256: 66a58df0167ae71e9421d88f44a4cb59395e8bd864799e1e4daa294d66a76f65
font_01_sfnt_off00014b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B80 10048 bytes
SHA-256: 7aa6ab133c33103b14b58358ca12fdf01461c66d86dbf674b1a6fc2561edc3c2