Malicious PDF — malware analysis report

Static analysis result for SHA-256 035ca53f0c8e0a9a…

MALICIOUS

PDF

102.5 KB Created: 2021-03-28 00:07:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 253bb9524572a316e05993d8253290ba SHA-1: d235513db10e3d975c89455469af9fb99e5af454 SHA-256: 035ca53f0c8e0a9a864095887e28f5fb15ccb2f17d2e0e6563f26bb70aeb3a96
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs that lead to suspicious domains, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nipisod.ru/award?keyword=aparato+respiratorio+pdf+resumen PDF link annotation
    • http://xolixelov.22web.org/xonenikesujegatolotovu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388048/normal_5fce451473a22.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/ieaEJja/88409084589.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/ujhhbnr/vifanebiwasuwususurarote.pdfIn PDF document text
    • https://cdn.sqhk.co/kususarefeja/0cejeYJ/45361875809.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/i7hdIjb/zombie_run_game_android.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/hjieEUq/stick_fight_online_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456122/normal_5ff6b83baa1cf.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/0Mjd8wU/troll_face_quest_video_games_walkthrough_level_33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467571/normal_5fce10714d019.pdfIn PDF document text
    • https://cdn.sqhk.co/nazamesuwute/jcDihhb/epic_empires_fotos.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/5jiXgfd/marvel_future_fight_mod_offline_apk_userscloud_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374517/normal_6006a804b75cf.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/9cbccf8f-de3a-4346-9935-b768f893880b/verbal_reasoning_sample_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/animation_movies_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d742f60-c089-42c4-9a15-29681178bb87/94451069787.pdfIn PDF document text
    • http://nazifaba.rf.gd/a4_size_paper_border_designs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/876ac072-3de5-4013-b619-49fa483e829f/biduzuvozalotasu.pdfIn PDF document text
    • http://janibiledepe.rf.gd/symmetry_worksheets_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/7279173907.pdfIn PDF document text
    • http://wazuvit.rf.gd/buffy_series_4_episode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/404e1f57-c811-425b-82a8-4e852758ae78/93477277998.pdfIn PDF document text
    • http://melewurimepuja.rf.gd/78151458569.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/functional_requirement_specification.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_off00014cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBE 5144 bytes
SHA-256: be0bbc6aac152007815393c1e950541fb6d86644cde465997a52825ea676e126
font_01_sfnt_off00015e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E2B 14828 bytes
SHA-256: 167958101d8243d8abd97395c9a3456627fd00b415407ddeed9251a0c53504e6

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