Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64b0f53b256828d…

MALICIOUS

PDF

75.9 KB Created: 2021-04-02 04:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4361508bd0f80013b56864997240176e SHA-1: 55fdfad864ace5e0229ede960a411ac2e30e5412 SHA-256: e64b0f53b256828d5b8522f4dc4d3a9197552efb2e121e164b045db3b24c3bbd
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://baarspo.ru/wix?keyword=tony+romo+commentating+schedule+2018+broadcast PDF link annotation
    • http://muzidos.iblogger.org/sipaza.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/geInheR/nuneraribo.pdfIn PDF document text
    • https://doxabonejanowi.weebly.com/uploads/1/3/4/6/134669922/951fcb875.pdfIn PDF document text
    • https://bobepeduzogir.weebly.com/uploads/1/3/4/6/134673546/mewatoz.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/6Vjhtif/arp_guard_wifi_security_pro_apk.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/woxotopapozokev/freeze_panes_excel_sheets.pdfIn PDF document text
    • http://japonovatiner.rf.gd/black_swan_nassim_taleb_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/bepanah_new_serial_title_song.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_98c1583aa67440a4b21c0439b60878c7.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_06f083413c1c4e048a99e2ebb42b2c58.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_7fa8d12834f84339af9cd49ca3754fa6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/96017059360.pdfIn PDF document text
    • http://zuvaxazalafes.epizy.com/67095952400.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/bubble_sheet_college_board_sat.pdfIn PDF document text
    • http://widadipadiv.epizy.com/how_to_find_entry_level_engineering_jobs.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_0a640712dc52422aa91b86de89e5b374.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_2fa22d0b2b19473abd67d03f2d7b807e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/jugupaguxado.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_off0000e5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CF 6064 bytes
SHA-256: e1ee10754da1101b3fafff2ca78f34e55e78151de96dc2f5e6f9557f85033925
font_01_sfnt_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 11236 bytes
SHA-256: 678e90f08750f62a82a3a4ea0859cff6c815fc1e751b3d6c2582943e78931ad5

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