Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23cdba41fd65d51…

MALICIOUS

PDF

133.3 KB Created: 2021-01-08 13:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0be93b19e4f8e61fc308face84b3f728 SHA-1: e6b4996dec7e619046051f3776e6d69750c820a3 SHA-256: b23cdba41fd65d516f1c73517fa20d0daf1c6c4a9c5620a8dfe9cd0af15d64df
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://trafficel.ru/aws?utm_term=chinese+japanese+dictionary PDF link annotation
    • https://cdn.sqhk.co/rilowikapaz/btXqhiO/24324617019.pdfIn PDF document text
    • https://vixekilawuta.weebly.com/uploads/1/3/4/3/134305586/naguvasor.pdfIn PDF document text
    • https://dobaviwipiz.weebly.com/uploads/1/3/4/7/134766835/dulajag_zufanefu_lozedoruf_pegeve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417419/normal_5fcc5fd25d831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415544/normal_5f9805bce52e4.pdfIn PDF document text
    • https://cdn.sqhk.co/mozedizupi/djjhZfQ/56793939018.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/ef74ee33-89b2-49a4-b11c-8f1db8b24d5d/gizmo_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zukukelejurotef/salon_de_refuses_millthorpe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb68fe2d-07c2-41f3-b587-c907af50e221/didegigogobubatemudut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07f8722-5790-443b-802a-999adf33f3ee/jexapuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/debc5fa3-624d-4a20-992b-b9cfe3f17fe9/jogivuledo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e97c70-4ee0-456f-8806-8ffc18ef0cfc/managing_engineering_and_technology_6th.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e39132-ca3d-4d5a-8da8-41e1d0cd194b/quiznos_subs_calories.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C2 35788 bytes
SHA-256: faf209cff8c7782694d92f6dbc57936cae5753ae579f5ff04390785f2d832003
font_01_sfnt_off0001a3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3B4 5116 bytes
SHA-256: bb70acbaccb0ef127eb133968d594380fae6ac3f200ab5744d2dcaf3157fd966
font_02_sfnt_off0001b514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B514 14596 bytes
SHA-256: 442eda805663a0afdf9eec2718abdede947740fa39badbd5fef61b2f3475dcd3
font_03_sfnt_off0001e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3FD 16332 bytes
SHA-256: 469db9f955e15fa9795508df556129481e926c2a93d534bce5646bdbca8ade14
font_04_sfnt_off0001f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9D5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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