Malicious PDF — malware analysis report

Static analysis result for SHA-256 1798f7e3618ca8d8…

MALICIOUS

PDF

71.9 KB Created: 2021-03-28 09:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b7d18452da939ec6d670b448a141c868 SHA-1: f80b75a2b4570d1c3be19d154af094c6b7eec339 SHA-256: 1798f7e3618ca8d8540edfde68e0a14cd4bcbb97e5cced7e2af5406a9123e048
186 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a mass of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://zajinet.ru/award?keyword=definition+of+basic+science+pdf', is directly associated with the document's apparent theme, while other URLs point to benign-looking PDFs, potentially as a distraction or to blend in. No scripts were extracted, but the PDF structure and heuristics strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://zajinet.ru/award?keyword=definition+of+basic+science+pdf PDF link annotation
    • http://kisizifavo.getenjoyment.net/59778293858.pdfIn PDF document text
    • http://guwejino.iblogger.org/tetris_game_app_free.pdfIn PDF document text
    • http://wuramegojuluz.mywebcommunity.org/cancioneros_con_acordes_de_guitarra.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/39f377ee-7181-44e7-a908-02dc0472e2ff/disney_park_pals_collectible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/465426b3-acb2-487a-8859-cc9e6115cf51/dark_souls_3_best_character_build_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/how_to_connect_to_a_kyocera_printer.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_be936d7cf184479a864b3fca6e1478f9.pdf?index=trueIn PDF document text
    • http://fidazel.epizy.com/automatic_transmission_system.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/c_scanf_double_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86fdb90-6519-4888-b166-c70d0950749f/actron_autoscanner_plus.pdfIn PDF document text
    • http://mukapekuruxades.rf.gd/norman_rockwell_biography_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/apple_music_songs_from_icloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ad0259-ed0c-4108-9b36-68bab89ad22d/vamuguzanedidese.pdfIn PDF document text
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_630e017263074aaea854c6003a1177c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/stihl_ms_250_parts_list_diagram.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_15138afdfaed459089efbeb59c1cf9f0.pdf?index=trueIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_f333d6e042524e6e9047ecadabc66318.pdf?index=trueIn PDF document text
    • http://loratozojakin.epizy.com/windsor_connecticut_weather_report.pdfIn PDF document text
    • http://gasapiloxa.rf.gd/madex.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/asio4all_software_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b32bebf-cd66-469c-bc1b-9d16b83ccb5f/51308068600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77b2c027-89be-4b73-958c-77823c80a8ff/who_plays_the_witcher_on_netflix.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_c32efcf87eee4aca9a2761b8e50f97b6.pdf?index=trueIn 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_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 5160 bytes
SHA-256: 1ace656ce4b4c4df30c7a7fa3fb963d749152cc9a6f97139a8f2d047716f4f28
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 10828 bytes
SHA-256: 96885830652fb5b06f0f35612d22c4f405d25218014919081d5255eb45cd7fb3

Open this report in the interactive analyzer, or submit your own file for analysis.