Malicious PDF — malware analysis report

Static analysis result for SHA-256 b446c174f0925c35…

MALICIOUS

PDF

69.3 KB Created: 2021-04-01 04:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 61ac781141184ce1465709fb68ce5580 SHA-1: e2028a54ab769f3a4480b48ebfa444f3fcb011a0 SHA-256: b446c174f0925c35525e05721aa9b137d3525ca438de8e59ffec18bb774f6b99
186 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 0.9996

Heuristics 6

  • 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.
  • 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://lozipotod.ru/123?utm_term=mark+carpio+hiling PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390350/normal_600ae644add76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488332/normal_5fce393f4a1d1.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/sewezazasapakepox.pdfIn PDF document text
    • https://vobubivozabu.weebly.com/uploads/1/3/4/3/134320693/5631063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402501/normal_60089c76c81d7.pdfIn PDF document text
    • http://fejoromawefobo.22web.org/the_death_of_ivan_ilyich_chapter_4_summary.pdfIn PDF document text
    • http://dipitazifageb.iblogger.org/repobusijeroxilegedawatop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jugixumob.rf.gd/cara_membuat_curriculum_vitae_di_hp_android.pdfIn PDF document text
    • http://jujewejono.epizy.com/bypass_icloud_smart_tool_2._0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be77afe-b31b-4b1f-98e5-86e5c9f1c1d2/the_linux_programming_interface_book.pdfIn PDF document text
    • http://jogiweni.epizy.com/xozixawovojuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bccfbd-d2cb-452e-9e1c-9c3d6d878197/46224358084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52f5965-ab97-4fa1-94b6-4c1d6182f0e5/kedomurixetosegakakowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8640b31-30fa-4645-8191-48bf17ef68ce/janome_hd1000_sewing_machine_for_sale.pdfIn PDF document text
    • http://jexusigek.rf.gd/hyperlink_function_google_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c839d8cf-9c3e-44c6-ad93-63f0e24c8a45/asia_neco_navy.pdfIn PDF document text
    • http://sepuxukejobome.epizy.com/cambium_networks_epmp_force_180_manual.pdfIn PDF document text
    • http://mojiwajatej.rf.gd/acm_icpc_2020_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc737475-06ba-43a0-858b-8e5d896f1437/musical_theatre_script_writing_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee4fdd3-5368-4186-91b6-630977270747/a_streetcar_named_desire_movie_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2d05c2f-c6ce-4ced-ba66-0caf7cc6be0b/zovopikamurovukuroxivub.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_off0000c861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC861 4676 bytes
SHA-256: 67e2f11539acbcd2483e695aab1d26b7cba3cfb6ee8e5c61ce1d40f79741b0b0
font_01_sfnt_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 9912 bytes
SHA-256: d86f3135708d4ccfe6e285ea1d35eabe90f63c068d5b91121344524798ee3729
font_02_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3