Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f36de952331e22b…

MALICIOUS

PDF

75.3 KB Created: 2021-06-11 05:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26b97e13884cdcc87937b3118e094670 SHA-1: 51fb4f58ba3a9b245a8847248d9959ff361b4955 SHA-256: 8f36de952331e22b9f6cd347d89721155ab124c6a604fa5fc596234b50c48bcc
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDF files hosted on services like pbworks.com and weebly.com, suggesting a link farm or SEO spam tactic. One prominent URL, https://oniceh.ru/pbw?utm_term=chronicle+of+a+death+foretold+pdf, appears to be the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/pbw?utm_term=chronicle+of+a+death+foretold+pdf
    • https://malekijewa.weebly.com/uploads/1/3/0/8/130813883/2055855.pdf
    • https://cdn-cms.f-static.net/uploads/4424024/normal_60bbe27811b27.pdf
    • https://zizavoxepob.weebly.com/uploads/1/3/4/4/134479394/tiweb_gedil_ravonojovi_bawatiwul.pdf
    • https://cdn-cms.f-static.net/uploads/4475580/normal_6063ad0470ac9.pdf
    • https://vomanoxugorufo.weebly.com/uploads/1/3/5/3/135331351/tulusumunova-ranogibonepefod.pdf
    • https://cdn-cms.f-static.net/uploads/4412583/normal_6068c60b2f900.pdf
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/gujakizogajegi.pdf
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5fd91ce83cd10.pdf
    • https://wixurawitubeza.weebly.com/uploads/1/3/4/3/134319602/5225997.pdf
    • https://cdn-cms.f-static.net/uploads/4490519/normal_60610d5cb5534.pdf
    • https://static.s123-cdn-static.com/uploads/4379854/normal_5fe13df5a9ca4.pdf
    • https://cdn-cms.f-static.net/uploads/4393363/normal_605f3c5893be1.pdf
    • https://cdn-cms.f-static.net/uploads/4450242/normal_6041e097561c6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pamotekegopa.pbworks.com/f/82485153108.pdf
    • http://numefen.pbworks.com/f/can_deleted_conversations_on_whatsapp_be_retrieved.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144419193/new_products_management_crawford_di_benedetto.pdf
    • http://rasovuxosew.pbworks.com/w/file/fetch/144666177/71704607327.pdf
    • http://tusawijer.pbworks.com/f/best_way_to_farm_silver_raid_shadow_legends.pdf
    • http://mosijiv.pbworks.com/w/file/fetch/145088799/neon_logo_template_psd.pdf
    • http://rekadezabo.pbworks.com/w/file/fetch/144825648/can_i_open_carry_in_new_orleans.pdf
    • http://gifavipa.pbworks.com/f/nevagezan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c4.bin
531067a3b0713d63b131bf1cfdea6f51cc8462097649f08e63b7d92dae6eec53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 4968 bytes
font_01_sfnt_off0000f9a8.bin
4bb774e408f940a75821c77557593d8f64bfb50e717d67dc50badf731c67fdda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 11104 bytes

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