Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9481107870a5ef…

MALICIOUS

PDF

81.2 KB Created: 2021-03-05 06:35:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 17dcd57ba981bed212bf9a270bb00612 SHA-1: b86cef2ab200288c23475042e2303a1542e9b1f4 SHA-256: cf9481107870a5ef14223d778767bc57a4842abf99c73aff14af95b5f6bf6a66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://soxebez.ru/123?utm_term=first+alert+carbon+monoxide+detector+end+of+life+warning PDF link annotation
    • http://bukenisefino.mygamesonline.org/toyota_camry_xle_v6_vs_xse_v6.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/what_is_the_poorest_place_in_new_york.pdfIn PDF document text
    • http://probmaka.tech/hide_and_seek_winnipeg_ratesy5vy6.pdfIn PDF document text
    • http://igme.site/660637848650k92p.pdfIn PDF document text
    • http://bathforlegs.xyz/4274363570680yvk.pdfIn PDF document text
    • http://getyourcredit.info/7269442905303gch.pdfIn PDF document text
    • http://weraka.online/kafebakejetofodobunewolq6qzq.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/28430249751sgumq.pdfIn PDF document text
    • http://1pokypki.website/32157004321r73gw.pdfIn PDF document text
    • http://my-favshope.online/99130060881lrf0r.pdfIn PDF document text
    • http://reawont.online/17551044750kzg0.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/470c08c8-4788-4003-9caf-5f2cd42eed96/stihl_hs_45_for_sale_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92120ee0-b1e8-42c0-b82b-189d0d9d381d/crossfit_workout_for_at_home.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/fatubujapibebizo.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/biochips_ppt_presentation.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/angel_wings_drawing_vector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/muwovekitunobeguzuked.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_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 5596 bytes
SHA-256: fd7b85c353f1834a8d60b7d3dcdf3512f1c56a6412904fe2e9fd884af3bb9bbe
font_01_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 10804 bytes
SHA-256: de609670db825eac37dd2f2bb9a76d1eb6e118a499b49e626aea8f3904d0970e