Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd545eb19ffab727…

MALICIOUS

PDF

85.2 KB Created: 2021-05-27 23:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: da6eb27f8bb6d07b263add6cbcda57b3 SHA-1: deff8493bb0655944091db4503e5dd8a299ef3c9 SHA-256: cd545eb19ffab7276a007b08a9a1d46b00218cccf8342f874b7aadc4f1834a3c
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 0.9998

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
  • 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://mezovuduw.ru/123?utm_term=dark+phoenix+english+subtitles PDF link annotation
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/9d1fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497650/normal_6017fa8a3d044.pdfIn PDF document text
    • https://minizaderi.weebly.com/uploads/1/3/4/3/134344024/2724307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_600c0c138219b.pdfIn PDF document text
    • https://lizakefamejoxen.weebly.com/uploads/1/3/1/3/131384135/rafubedupevobi_sowanezutekal_zekiwubatogez_bikofenu.pdfIn PDF document text
    • https://xijaxerunoseme.weebly.com/uploads/1/3/4/3/134306079/tuwibinokeg.pdfIn PDF document text
    • https://girowefado.weebly.com/uploads/1/3/5/3/135349553/cd4dd4101c7a790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_604716d731d18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_60005a8e7952c.pdfIn PDF document text
    • https://xovesoxak.weebly.com/uploads/1/3/0/8/130813458/e7e01.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/2f16f6c4-f03e-44f4-b5cd-73b27492c170/explain_the_4_main_principles_of_natural_selection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bafd75d3-c89c-4985-90d1-0f3a788e0b6a/75412367816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470168cb-c2c8-4ce6-a2d0-d45084477de7/nukovotiderunejobidusozek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b4d995a-3fc2-425f-a650-c43fdf1380a1/call_of_duty_apk_and_obb_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f234291-12dd-4fab-9efa-f14d77581186/94671309655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3629e83-f6a0-4f5d-b031-a49864be114a/what_is_your_leadership_style_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a725f114-aa0b-4c33-90c9-74048b4dff28/lowes_harbor_breeze_ceiling_fan_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a084c926-b878-4dff-92ae-abe96dc10a2e/stalker_farming_guide_warframe.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012fd3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12FD3 16732 bytes
SHA-256: 68ecc20ca138b186627527428a3fe857151a21b5ac4822027cc1718169f876bc
font_00_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 5352 bytes
SHA-256: 6eb436f3546802c7252d18081b59c300fbdd1c044db06b7686fa29e4144844af
font_01_sfnt_off000105c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 12628 bytes
SHA-256: d3c29010334f2cc34c91bde174f847d665179f90312ca5301d75cc73ebbbb178