Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c52b4fbae8c04ae…

MALICIOUS

PDF

75.6 KB Created: 2021-03-13 13:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 164883bdb63b74956eb3cd42924008bb SHA-1: 76eaa284f52bd09790d07074b3f501e2ae1c3ca8 SHA-256: 9c52b4fbae8c04aee1725784c973a6a8d8483a46334225e937e3114cc7cc21a9
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by heuristics as a link farm and potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary URL, 'https://nipisod.ru/award?keyword=algebra+worksheets+for+grade+6+pdf', suggests a lure to download or view content, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=algebra+worksheets+for+grade+6+pdf PDF link annotation
    • https://cdn.sqhk.co/xogodapap/hdyMhib/dairy_milk_production_process_ppt.pdfIn PDF document text
    • http://getallcreditscores.info/miwowuwusonajekewgwxg.pdfIn PDF document text
    • http://xodufaviwez.iblogger.org/laravel_blade_form_action_route.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/Mugerjf/bakugan_fan_hub_download.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/adjectives_nouns_and_verbs_worksheet8fuu2.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/agehggc/25559658481.pdfIn PDF document text
    • https://cdn.sqhk.co/wowixepis/iHfuAem/27542455621.pdfIn PDF document text
    • http://pewavari.22web.org/a_storm_of_swords_audiobook_cd.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/95874eb1-2845-4e8a-9bbe-b0b860089590/world_war_z_2020_gameplay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9610b577-476b-4455-92d0-24e6f2fcb09f/53705135253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be89030-22c8-41b3-a91b-dd350286f578/jogekutoba.pdfIn PDF document text
    • http://zavujosabojid.rf.gd/lixenipolapawebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/161415cf-30a5-445b-875f-910b97933269/lightning_returns_guide_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aebd96b2-2da0-4889-90bf-ffd2f13a414b/casio_gzone_brigade_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3cb5c06-45d5-48a2-9783-2a574be8be32/16920918699.pdfIn PDF document text
    • http://guvubaxi.epizy.com/abecedario_letras_grandes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3f9c997-3ab8-4fbe-9391-f558fdf90596/which_water_heater_is_best_in_india.pdfIn PDF document text
    • http://jifafometabugev.epizy.com/74443385657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e92cf0e-bba9-4267-83a5-ec7546f627b8/biwir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54977c8-a2db-46e8-a9e2-3f9b3d1c2b4d/85450276645.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_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 5740 bytes
SHA-256: 046b9c8dbc0f673386c9a233dc8d1a2a6906d9d41aee66320bdddc2af25774a3
font_01_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 11128 bytes
SHA-256: e60f2b62823264758168146f073167d4febfb15fbe5a0196bee3176dff289bb4

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