Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ec5ccfb9bace35…

MALICIOUS

PDF

85.7 KB Created: 2021-03-14 11:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 10ed55c530b9bcbbeb4b2e102b409997 SHA-1: 2e1c246b2e757e24d0a99524e48227c8d1ce5ef1 SHA-256: 83ec5ccfb9bace3545ae05e602eae7dfe7828c57d1f7accb6c2506e06a32c3eb
74 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and heuristics indicate it is a link farm designed to trick users into downloading files. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external URIs, including one pointing to a suspicious domain ('ponafet.ru'), suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/award?keyword=employment+income+certificate+pdf+download PDF link annotation
    • https://cdn.sqhk.co/wewuxujudu/Zhb8Cgf/top_trending_video_games_2019.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/mipubovoli.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/lochinvar_crest_boiler_flame_failure_problem.pdfIn PDF document text
    • https://cdn.sqhk.co/jozanafe/gghagd9/road_trip_films_list.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/drijzif/488117021.pdfIn PDF document text
    • https://cdn.sqhk.co/gotubosif/hdD2gh5/download_battle_chess_3d_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454299/normal_603b6bfd2c0c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490917/normal_5ff861377c117.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fd08eb31cbc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_603365b4ef26e.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/gijhZjb/tetris_99_dlc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://gegokuberil.rf.gd/sea_animals_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/jacksonville_jaguars_injury_report_week_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/363a6072-abe2-42de-9422-f82f03ade038/davubenutadasazesimet.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/fumokawedemebosag.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/rezaxewenaloretu.pdfIn PDF document text
    • http://kijemuf.epizy.com/how_to_pair_audio_technica_at-lp60.pdfIn PDF document text
    • http://vukilef.rf.gd/psx_iso_brigandine_legend_of_forsena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffea1171-893c-447e-998e-d476e3884a9d/webasto_heater_parts.pdfIn PDF document text
    • http://podapuleleg.epizy.com/accidents_reported_today_york_pa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ce6aff-b795-4da6-929a-734114873f26/what_is_the_best_bear_bow.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 2988 bytes
SHA-256: fbe1f4cb8d169c31286959b6896ac665818dc623cda0c2ad134980d8484b8aeb
font_01_sfnt_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 5276 bytes
SHA-256: ebb09bc6d48de196d5cc2e6366c761569142cd72f6b2e0a5cfea89203843dea7
font_02_sfnt_off00010ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 10652 bytes
SHA-256: 6cedbde8c60f294320a90120abe8c7dcffad903b4f5d7f2034c78bd3c0b1aa33
font_03_sfnt_off000131ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AD 6400 bytes
SHA-256: 6d5c31ff437d216f2d550cc9809ed6cbfc703da14fe642c330b9de1134e2ca79