Malicious PDF — malware analysis report

Static analysis result for SHA-256 775c64a1f7fd55bd…

MALICIOUS

PDF

78.2 KB Created: 2021-06-01 10:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a1faaf5ea79bd18113234a2dd9349d4a SHA-1: 4962413c546ff28c3661f57f3d1c2ca20ab1f066 SHA-256: 775c64a1f7fd55bd1840618548523094695d56344169e9464e0d4f3e8024c7b8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains an embedded URI pointing to 'https://nipisod.ru/123?utm_term=bixby+apk+galaxy+s7', which is likely a phishing lure. The PDF structure and embedded content suggest it's designed to trick users into visiting this URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=bixby+apk+galaxy+s7 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421934/normal_5feb99c951ee5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487424/normal_5fd84edf8ee29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_601f738413290.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4407988/normal_60b5781cda6c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_603f7367c837d.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/4df4efd8-9a69-4d57-9857-2f0d7872f74d/how_to_create_user_account_in_wordpress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b3458d0-5784-4f0c-84d7-f9c9e234cbbc/neliriluwufosobarizinamil.pdfIn PDF document text
    • http://naxenuve.pbworks.com/w/file/fetch/144448749/gafabepopusabujifeviwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc71bdff-e1a4-4502-b1d8-951b00346e1e/lufijane.pdfIn PDF document text
    • http://vamafob.pbworks.com/w/file/fetch/144450042/do_kaz_and_inej_get_together_reddit.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144431553/56852243714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0113f445-d1bf-4db9-b681-c54a4985b8fe/jedozora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/927a304d-0f2f-420b-a9ba-f08ff246f985/what_is_the_meaning_of_desktop_study.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4754d7b5-6501-438d-9de6-27c0eb411302/41266587076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87f1233-7748-44df-b731-f64ea6fa8a9c/41456046988.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/f/8.pdfIn PDF document text
    • http://kukepofarit.pbworks.com/w/file/fetch/144446472/the_cuckoos_calling_cormoran_strike_series_book_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d303c2e4-74e8-4bfd-9ff8-a823cf796369/benixuwizuwikufomos.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144432225/9_snf_kimya_maddenin_halleri_konu_anlatm_tongu_akademi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ed74e4-b0e3-4911-9571-7553e61bbc2b/jidifejamuwigijapad.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_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 5396 bytes
SHA-256: 7bea7dfe26e7b0d07ef2f953a7d0e8a79514313dd7f5fefa2ab4ebd77859a8ae
font_01_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 15044 bytes
SHA-256: 3ef5db4b23c23ca485750212978b1ab19a8a7a200b598a79eb56292fcd2dca5c

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