Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd23d91415e7856…

MALICIOUS

PDF

77.9 KB Created: 2021-05-29 09:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2318c33a01a432a568fec21a49a2f208 SHA-1: 84c179e344f357348f324972d5f57a0d76753f6e SHA-256: ddd23d91415e7856d511f62348b5d4d9c0ba57f964811673531009c5dbdce3ce
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 0.9990

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://jumiwimov.ru/strik?utm_term=6+claves+para+aprender+ingl%25C3%25A9s+pdf+descargar PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455659/normal_5fddb0a96f45c.pdfIn PDF document text
    • https://bavopasivivewid.weebly.com/uploads/1/3/0/7/130738836/xawipipisa.pdfIn PDF document text
    • https://wojaxesisitofem.weebly.com/uploads/1/3/4/7/134717171/vidafafufofike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_605ef6bac89fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487905/normal_6026de22c4aca.pdfIn PDF document text
    • https://povilaromegew.weebly.com/uploads/1/3/4/4/134486615/c5d2a242.pdfIn PDF document text
    • https://kipowiginudi.weebly.com/uploads/1/3/1/3/131383469/vijigulusuxufa-nemud.pdfIn PDF document text
    • https://vigojipawus.weebly.com/uploads/1/3/2/6/132695212/jirezuzutelep.pdfIn PDF document text
    • https://dasitonaz.weebly.com/uploads/1/3/4/3/134379343/3411478.pdfIn PDF document text
    • https://saxesejidor.weebly.com/uploads/1/3/4/6/134694827/2073415.pdfIn PDF document text
    • https://zazokovorif.weebly.com/uploads/1/3/4/3/134321981/xuvabilejuzix.pdfIn PDF document text
    • https://puroporutenes.weebly.com/uploads/1/3/1/6/131606954/8415212.pdfIn PDF document text
    • https://jowapiwinutakun.weebly.com/uploads/1/3/4/3/134365581/dobit.pdfIn PDF document text
    • https://momibugu.weebly.com/uploads/1/3/4/6/134674353/7701802.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/bed180c7-36c8-4515-882a-6306c6142fe9/raboginasefog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a97ec63-b267-4aca-a2b0-f8fdf2bc977d/8512955403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84868e7f-42b1-413e-b073-bbf447627774/tosojub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a267d27-51c9-460c-a5f4-0736c506bf02/city_of_bones_tv_tie_in_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dbfa1d1-c90a-4614-8c9e-2a5d7a77a3a9/how_to_hack_shell_shockers_2021_aimbot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b921f1f1-2951-47db-b234-bc069b1eac82/how_to_reset_airbag_light_on_2007_chevy_silverado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6cb3140-4090-4bfa-97e9-ea57df5d9466/can_i_get_a_replacement_remote_for_my_roku_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea2533ad-b011-4bb5-b9d5-d493b412b5e2/cushman_1600xd_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bef98d1-1e52-4d74-a217-25823d3531c4/bufezuzenulewimamugaralul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35f4a18e-a6ef-49aa-ac3a-e3c9a2a38965/86472591524.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_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 5584 bytes
SHA-256: 55d004c8c7a2586d5339789ba22b22fde2635b33eea1dbebdd25fd4dbab7dc31
font_01_sfnt_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 12212 bytes
SHA-256: 8f1dcfc0a04edad54cb91cd9b214c0b67f2d461fdf510119789fb93329cc4dd2