Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db9dac80cdf4e26…

MALICIOUS

PDF

87.0 KB Created: 2021-03-26 06:01:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e5597ea645a86ff8d9ebb57365070a0c SHA-1: daa1642406875ca75cc212a7e9f4b73b6a979d74 SHA-256: 7db9dac80cdf4e262b37e29750f19df70bf8d4d323c6558420b61040b8dc44cf
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 0.9989

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://botokaw.ru/123?utm_term=sub+letting+tenancy+agreement+template+uk PDF link annotation
    • https://nipawivas.weebly.com/uploads/1/3/2/6/132680981/vevug.pdfIn PDF document text
    • https://mumasibomogavap.weebly.com/uploads/1/3/1/0/131070301/1312275.pdfIn PDF document text
    • https://nesujuge.weebly.com/uploads/1/3/1/4/131407687/libawa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367648/normal_5fdd59d585a68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410186/normal_60321cfd01f42.pdfIn PDF document text
    • https://sogutujugaj.weebly.com/uploads/1/3/4/4/134403955/dibifuwutajuxupizew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375344/normal_5ff10c9bb1422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5fdad96c12fc1.pdfIn PDF document text
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/pegovig.pdfIn PDF document text
    • https://gonewama.weebly.com/uploads/1/3/4/0/134095907/1550028dfe2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465025/normal_5fdedca2f4141.pdfIn PDF document text
    • https://tebiwexarug.weebly.com/uploads/1/3/1/3/131380746/6663225.pdfIn PDF document text
    • https://fufarolobol.weebly.com/uploads/1/3/4/5/134597676/kidopuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422879/normal_5ffe73bad31c7.pdfIn PDF document text
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/josepawesajew-bisemu-bivadojenu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487005/normal_5ff98acfa447f.pdfIn PDF document text
    • https://mekumago.weebly.com/uploads/1/3/5/9/135981587/lajuwira.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_59053250e29149bcac9e607e07380a8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2082cff-00d1-48b4-9563-0012159b013e/genie_model_2028_manufacture_date.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_68eb6a2a73bc458e8f2eae7928ea37be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7999983c-3727-4c67-864f-2efc830b8ba0/can_i_update_my_nook_color.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_1f67116431bf402bbb6e2a9a9da5bfe6.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_c80a93cf74724c46b2ddf69c1141b3b8.pdf?index=trueIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_b1b0d927009649dcbe54cb4bab96d611.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 5484 bytes
SHA-256: 2c705211edc83399b02ac999febb5161850b6ea1bbb2b843d7b87b98d81bf5e4
font_01_sfnt_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 11072 bytes
SHA-256: bfb9bc963729bd93ffaee2558977d5f86a04ecccb8949503b9c5d2e7931b3ed0
font_02_sfnt_off00013652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13652 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e