Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f24b2e8100f3b7…

MALICIOUS

PDF

72.8 KB Created: 2021-03-07 23:20:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b99cd1826ea9269af0a6fe65ec9211b0 SHA-1: 9cff96ec157901c28f1c1bfb3fc9fb2735c6c94c SHA-256: 80f24b2e8100f3b74117acb4526fb778cbc1c5101cc30c146b29868a16b254f1
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple critical heuristics as malicious, including a link to known malicious redirector infrastructure and a large link farm. The embedded URLs and the structure of the document suggest it is designed to direct users to external, potentially malicious, content, possibly for SEO manipulation or to host further malware. The ML classifier also strongly indicated maliciousness.

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.
  • 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.
  • 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://dafemum.ru/wix?keyword=uncharted+waters+online+nanban+guide In PDF document text
    • https://cdn.sqhk.co/wupefukawis/bTygfoH/jw_library_app_not_working_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/hjjgdhg/descargar_my_talking_ginger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369926/normal_60222bd4c1b4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489979/normal_5fd84fbb834eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387716/normal_5feb155d2db9d.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/bGibjj3/robotics_jobs_boston.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/kD5fgcn/98695219093.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/f70VGih/genatex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_601b0077457d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_5fda9a03a5e77.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/bb06a756-febc-4c26-bccd-ebf8ce680aa1/nes_is_blinking_red_light.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_410560c30b724949a7e65d146013d6b3.pdf?index=trueIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_d8736bba176c486ea554a03f14fea7a7.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_1499ae5a89b6464b87d469c556636938.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_a2a66f4f772d4f839a178730bb9193da.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_4e643227036a47119694ea488d8b71d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf20554-328f-4741-8839-182e93235d3f/nezazexomalutosisi.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_dc12fe12b609498aa857e0cddda57bbb.pdf?index=trueIn 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_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 5424 bytes
SHA-256: 1f2bb4689c83643c6ac7b258c99bdc63217750546c445a233289ad8e0aac39ca
font_01_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 12944 bytes
SHA-256: a401ef39989633f4ee194450014619c6869578c17cfeb637aa82876430c81bb7