Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6754278597ab382…

MALICIOUS

PDF

97.3 KB Created: 2021-04-09 21:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4e2c05b87920fb0e18582e9403a01024 SHA-1: 7112504a86203fddd9b67bbfb77684e220903b43 SHA-256: c6754278597ab382d3844f7673578f0191d3cf9bbbf6fbb7e7883f9eaf4de1ff
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://ponafet.ru/strik?utm_term=what+settings+are+best+for+night+photography PDF link annotation
    • http://kinemulawaw.sportsontheweb.net/model_3_long_range_vs_performance.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375528/normal_5fc6bb1df3783.pdfIn PDF document text
    • http://kogejirupu.getenjoyment.net/medical_dictionary_english_to_urdu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473359/normal_6033af284cea4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379035/normal_605ee206e3e44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_606665367206a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490269/normal_5ff159f811d69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_605225e1db445.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/information_security_risk_assessment_toolkit.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
    • https://uploads.strikinglycdn.com/files/89eeb213-0c19-492b-9dc6-750a54485bae/rijikexenix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13014546-2418-43b8-92bf-b239efd87f10/62797545775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc37c53-f6e9-4119-92c0-da72106827b9/is_stick_welding_the_easiest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61694679-f979-49db-bfdc-999f3f771a89/dr_brown_bottle_warmer_and_sterilizer_instructions.pdfIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_f196b3da4ff6428cbc2e4f01f643a9c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb079a6-2648-41bf-adcd-727dbe69e20d/5728851260.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_304f4f0627a84c6897ce4f0c3236f150.pdf?index=trueIn PDF document text
    • https://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_d4b1b3fbc13c48ddb2a8237faf6b436c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/358f1178-5f3d-4de9-9210-1689c58bb64f/is_perth_australia_expensive_to_live.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/23234499085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce19fec2-c713-45b3-a9fb-080bee7a1002/zyxel_pk5001z_modem_bridge_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4beaad80-9f4c-4934-baad-4e86a41c5863/yard_machines_snow_blower_22_inch.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_off00013179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13179 5172 bytes
SHA-256: 31ae95b590bbbc47448b6674c626d63149826dae79e8a17ab48274ce0665e8fd
font_01_sfnt_off00014313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14313 10780 bytes
SHA-256: 07bc59f91e02065f0ae8b0b4174b268d16a2b12bfd501aad5f30bad347fee799
font_02_sfnt_off000167f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167F5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3