Malicious PDF — malware analysis report

Static analysis result for SHA-256 44556b24cb69a4d8…

MALICIOUS

PDF

76.2 KB Created: 2021-03-29 21:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12f2e32e5a032e796e25c922b54d5e20 SHA-1: 1b80469736786fb498dc844ff6bbaef58fd96407 SHA-256: 44556b24cb69a4d80f94539c31530ebc411891d14db7b202f80a16c30a45785d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, with several heuristics identifying it as a link farm on disposable hosting. The primary attack pattern involves directing users to these external sites, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/wix?keyword=robert+c+johnson+foundation
    • http://bullbananavannaone.xyz/xosamimosusuj3ntn5.pdf
    • http://thesimplycompleteseries.com/photo_editor_free_app_download_for_pc6ur8o.pdf
    • http://rikafitamedad.medianewsonline.com/54111044028.pdf
    • http://govuled.mywebcommunity.org/74709485719.pdf
    • http://filemarker.store/zuvabunjolz.pdf
    • http://normaa-id.com/sharp_aquos_lc-32le653u_manualovk7t.pdf
    • http://ninijefaligogi.mygamesonline.org/oxford_discover_3_grammar_book.pdf
    • http://xafopawiki.medianewsonline.com/calcium_hydroxide_in_dentistry.pdf
    • http://opensalle.xyz/75100309863ucexy.pdf
    • http://ruwazumusef.scienceontheweb.net/streamline_departures.pdf
    • http://vinnipoh.space/14698522027d2ygo.pdf
    • http://douchehq.xyz/67821194277jrriz.pdf
    • http://daating19.site/podcast_app_podcast_player_podbeanlf1my.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://totuxivez.onlinewebshop.net/zegenafufobusitukip.pdf
    • https://uploads.strikinglycdn.com/files/9ed78571-9d19-49bc-8593-78ed399494fe/gepuzi.pdf
    • https://s3.amazonaws.com/wobuzisibal/44680986503.pdf
    • https://s3.amazonaws.com/wejuvono/7564429380.pdf
    • https://uploads.strikinglycdn.com/files/ae5be8ef-e3cd-4b4d-8b1b-031b2bc11e8b/22404918649.pdf
    • https://uploads.strikinglycdn.com/files/0d58d74e-5ee7-499e-bd5a-00ad0a765722/ratatitekuwarufifuxur.pdf
    • https://uploads.strikinglycdn.com/files/1e25b144-82a7-46ee-ab4c-80f5ee821f8d/is_magic_tree_house_fantasy.pdf
    • https://s3.amazonaws.com/ropidadegaxut/refipufuzakonujisa.pdf
    • https://uploads.strikinglycdn.com/files/15d110b9-6e29-412b-9669-96e438b45a39/mebalowemokeduzajowi.pdf
    • http://xufoziminep.onlinewebshop.net/sirinuwefatogebidutobi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb27.bin
92763c9d4505c71bbaa7cf5651872944049fbb47e08cf8abdad91dd0cdc24604		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 5300 bytes
font_01_sfnt_off0000fd32.bin
c8bf05866b6c8219638ad711d76757fd71bacac5333658307fda417072358a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 11160 bytes

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