Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02b1d4eaac0bbfa…

MALICIOUS

PDF

81.7 KB Created: 2021-04-01 23:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9360fa96146a50687a07a68e81853c0c SHA-1: 8ecc5c1edb874694c87634351f0c14cf72bf1083 SHA-256: a02b1d4eaac0bbfa044e22d79270635da64a14b7a1948213dff7df3a8ca62251
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to product release dates, suggesting a social engineering lure.

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://jottigo.ru/strik?utm_term=hp+probook+release+date PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4428083/normal_5fd0930817d8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460247/normal_602edc2bd6559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_6040772fcc9d9.pdfIn PDF document text
    • http://naxiramomamaz.66ghz.com/netitoruveminu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_5fdc3b3e735f8.pdfIn PDF document text
    • http://kepekusajox.iblogger.org/bmw_ag_balance_sheet.pdfIn PDF document text
    • http://gepizufejilubis.iblogger.org/tabelitexonubikupewule.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/4a0ee1c2-4a89-44e2-b7cb-e420e5400042/marketing_plan_template_for_small_business.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/71256688350.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_379cb3cb27d24c7aa6d0fffe22c1f9be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/755b83c3-a090-4ad0-b229-48c1c3a8befd/dantes_inferno_ciardi_download.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_8ad6112e2d104d71ac2b987b35888cc9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libosokune/bsc_nursing_ki_form_date.pdfIn PDF document text
    • http://burerekel.rf.gd/combining_like_terms_worksheet_answer_key.pdfIn PDF document text
    • http://bigerubuseke.rf.gd/19062353510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23df2413-caa5-4753-bcd5-6c9851143f46/unit_conversion_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/dungeons_and_dragons_5e_character_creation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/mansfield_town_fc_football_ground_guide.pdfIn PDF document text
    • http://xuvafinuvewabek.epizy.com/decimals_on_the_number_line_worksheet.pdfIn PDF document text
    • http://zekafoweratum.epizy.com/96263596555.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_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 5120 bytes
SHA-256: 6b0dc964ccf13cf85d579d8e0f16965ec0b21d8dcc8676c66e5465b2bf86cbcf
font_01_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 10992 bytes
SHA-256: dd82b12b3e532b12da37475262ed355605d6b0a84e0de4cc9c213e542fcfbdde

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