Malicious PDF — malware analysis report

Static analysis result for SHA-256 691b53b0c7f93aa2…

MALICIOUS

PDF

66.8 KB Created: 2020-12-16 01:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e170631c7b00d466cd3f8cbdc6303a0f SHA-1: 144c9db4b6919acd2e1c03152e73fb837692324c SHA-256: 691b53b0c7f93aa2484197b87ef1aa19c3d5b775ffccae180f5678e4a1d81795
274 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. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/37d1abe04a0.pdf.
  • 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://cctraff.ru/123?utm_term=d%2526d+5e+eberron+airship In PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/37d1abe04a0.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/fasinigukex.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/19179d2b-7144-420a-988c-c9b28af6c0fe/spyglass_don_t_starve.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/shito_ryu_genbu_kai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da5c158-0b3f-4882-b3ef-e864eed4a588/reference_materials_worksheets_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460f6452-dab7-430c-bb96-aa956b8d7ccd/oracion_de_alabanza_a_dios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f300a2-2133-4412-9139-7832185d7155/adobe_flash_player_update_application_initialization_error.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/94340626893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97924de8-e762-4d62-998e-9522a3f5a8bf/rezifozuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7fd4f36-9168-459e-af44-9a6af4ce09a2/40950237672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e29c073b-a887-4428-8add-c8a8a7ea9792/57842411376.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/75193325418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ebba95-f071-4a46-be4f-84ce98711fc4/lisetedoraropebuvagisozus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43dbc9a-f2fc-493e-96db-7f72aa608be6/lovamukenilotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13008fd5-26c2-4585-a0ee-5680cc7a4d87/doguvunifulipu.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/29628592320.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/11048183290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d560572a-5822-4efc-aecd-e7e836d8b6c4/.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_off0000ccea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEA 4156 bytes
SHA-256: 5ae3bcc49c87f96444fbe3d11ff27db43b6aea299416b9f3d286273c64098da8
font_01_sfnt_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 10416 bytes
SHA-256: 65f8fe20d3a594cd97eee78557210feda46427c4f998090afb3d1dcf6bb6958a