Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd7855ca5a331c5…

MALICIOUS

PDF

93.5 KB Created: 2021-05-01 02:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 446fa5aaea6dbb1aebb9fc5e075ef003 SHA-1: 7afd4952c0aeae459176374225f4f962ad7dc427 SHA-256: 3fd7855ca5a331c57ba1d08998111dda8e397a76d6d02e376fbb691766a28e84
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to 'bologen.ru' and another to 'xowobovu.myartsonline.com'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://bologen.ru/strik?utm_term=hobart+model+610+meat+slicer PDF link annotation
    • http://xilenemivagola.mywebcommunity.org/spanish_adjectives_list_a_z.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/the_practice_of_adaptive_leadership.pdfIn PDF document text
    • http://gakemuxuk.22web.org/upkar_publication_books_for_rrb_ntpc.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/karyotype_worksheet.pdfIn PDF document text
    • http://easterthjg.com/rumavoruomotg.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://legalvictory.group/what_is_a_catholic_breviary8y7en.pdfIn PDF document text
    • http://rasazajafatirek.mypressonline.com/sony_blu_ray_player_bdp-bx59.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/axelson_pressure_switch.pdfIn PDF document text
    • http://wonnaturila.space/kemupodofewumemet5sjn.pdfIn PDF document text
    • http://siteznakomstv69.space/how_fast_does_a_polaris_trail_boss_250_go8t43d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xowobovu.myartsonline.com/99533267701.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/30764555503.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/vimaze.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/50485661457.pdfIn PDF document text
    • http://todifisafi.atwebpages.com/crane_signal_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/kitoxisuxiresigigisene.pdfIn PDF document text
    • http://jawuwibunoropo.atwebpages.com/66579986043.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001218f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 2952 bytes
SHA-256: e211f2d6e0d1bf1fd17bd5150bc2724fb7c0f1d37b1c69b855d9dcad8de34ab0
font_01_sfnt_off00012c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1D 5532 bytes
SHA-256: f0ca3602988335973adc39c1f74e5879c07e0b9db06785fff5b6db8c11909252
font_02_sfnt_off00013ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED5 12256 bytes
SHA-256: 46f6beeb4e2c37db115245b32c93bd3a1419122f4a748f3efcb9750321bb99df