Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbeeb74f6fc4014…

MALICIOUS

PDF

78.9 KB Created: 2021-05-14 16:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b9b9f11e712698b4a6242b50dad43ee8 SHA-1: 0751479bf04682079d775998264bed0788090293 SHA-256: 8bbeeb74f6fc40143583269a7de43a2042d1b3978d71b174e9ded9f8a7478d39
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, with a critical heuristic indicating a link farm. One of the external URLs, 'https://xezojetit.ru/strik?utm_term=safety+razor+vs+straight+razor', is flagged as unknown reputation and is likely part of the malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/strik?utm_term=safety+razor+vs+straight+razor PDF link annotation
    • https://cdn.sqhk.co/ganuniwiku/lihjahb/wewuvozunot.pdfIn PDF document text
    • https://cdn.sqhk.co/jodanonot/gfAUidm/bicched_gaan_video.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/chejhUs/kiwulesududemarusupuniwaw.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/yhfhjYE/lirojujajukijomezaxuwilaw.pdfIn PDF document text
    • https://cdn.sqhk.co/temazajilib/dqjjcib/mud_trucks_racing_4x4.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/LCgjdha/pencil_box_kannada_film.pdfIn PDF document text
    • https://cdn.sqhk.co/someteku/ehghhgj/69167326859.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/iaxhghc/driftwood_beach_flooring.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/olentangy_liberty_high_school_bell_schedule_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/79218526568.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/alcohol_52_free_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/fafazitaxunaxuximerifasam.pdfIn PDF document text
    • https://f8bd9030-4518-40b4-9047-d478e6ffc17b.filesusr.com/ugd/608fe2_b4a99f8d74944b9d8c718cc333e6f84e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pobixedele/fubolenotobolamakagizu.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/mandrill_templates_alternative.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/free_game_beach_head_2002.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/4591297978.pdfIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_25831fa0afe74e969c3248589fa4b817.pdf?index=trueIn PDF document text
    • https://9177b9cb-4c70-42bd-a9e0-27a1bf53b67b.filesusr.com/ugd/9baf76_16a134abc7984886922053f7e26ff12c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/pesquisa_bibliogrfica_metodologia.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/whatsapp_backup_from_android_to_iphone_xr.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_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 5312 bytes
SHA-256: 1cc0bd4d05093b57956d333cffab2f2d2339479ff4068044001e7590f580cc19
font_01_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 11268 bytes
SHA-256: c04d3d3a84a52e5ce362361cdc7da3dbc116fafb4edb93b09a1ac38576ea6beb

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