Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d53e5e604ebae2…

MALICIOUS

PDF

78.8 KB Created: 2021-05-13 15:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7ac857837642380920975ca1f13ff5e9 SHA-1: 734499e359177570d30fc6864a7edcb6c3dddac7 SHA-256: c8d53e5e604ebae2ce7adbade4d039a6b6c544da1012defe42b50f4e6c27ef2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, contains text related to downloading software, likely a lure to trick users into visiting these malicious sites.

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://jottigo.ru/strik?utm_term=how+to+download+unity+hub PDF link annotation
    • http://guronid.mygamesonline.org/carpinejar_livros.pdfIn PDF document text
    • http://lixebafevoku.mypressonline.com/33682588622.pdfIn PDF document text
    • http://cashbackk.site/java_1._8._0_181zyxya.pdfIn PDF document text
    • http://fruit-citrus.space/7524164999c1vbf.pdfIn PDF document text
    • http://waparudadip.mywebcommunity.org/gozoren.pdfIn PDF document text
    • http://drilltech.info/6184174824b0c0a.pdfIn PDF document text
    • https://cdn.sqhk.co/lukuvekeliki/cEidtPG/general_mcinerney_cia_frankfurt.pdfIn PDF document text
    • http://helpcopyright-service.com/the_chronicles_of_narnia_the_lion_the_witch_and_the_wardrobe_book_summary4h8p1.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/what_is_treasure_island_sf.pdfIn PDF document text
    • https://cdn.sqhk.co/tagodepa/jwUujfA/descargar_speaker_booster_plus.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/gegdNxH/capitalism_history_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/DgggfWw/star_wars_squadrons_gameplay_no_commentary.pdfIn PDF document text
    • http://gasolotiravizid.sportsontheweb.net/jofumosopopesejubum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_1f76f62d1c29452ba06645068a30ef85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce3325d1-e04a-423c-8b9e-a194485a12b8/15520954386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c9604d-8ada-44d5-a97f-4707c0f7b830/what_is_a_common_law_pure_trust.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0ccce5-b18f-4d5e-9023-ab07df99d1eb/napaxen.pdfIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_41d4e04f450841ab8be4d7ecd00298d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/def75b28-364a-4bdc-9afc-01f18e1be935/wimam.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_b735f99a384e4fb1b7a837ec0de668d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3de5977-30c2-4e2b-9873-8d5b8b004a0b/how_do_you_use_reed_diffuser_sticks.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_946541af9e0f4074b46c944cdce534f3.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_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 4932 bytes
SHA-256: a0dbbfecbe9ec4563a0e34a48c92011eb5822722a135aa1d4fbf9957636aa0bd
font_01_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 10836 bytes
SHA-256: a3786b410cf99a98764b96f2520b7f66df8c4ac846a8607a27fc14b1f8bdd9cb

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