Malicious PDF — malware analysis report

Static analysis result for SHA-256 26395badd2486bc0…

MALICIOUS

PDF

70.7 KB Created: 2020-11-21 07:17:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 540918de6fa7199664cbbe2125fa5d1d SHA-1: 292d52e177b06bdc7a12797c0771a2091b0cf507 SHA-256: 26395badd2486bc0ce2ae2bc99361ed3a3d09aa68fc07be62181c0ac7bcbd22d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical PDF link farm detection and a machine learning classifier, indicating malicious intent. The presence of numerous external URLs, such as 'https://trafftec.ru/123?utm_term=schwinn+varsity+1250+walmart', suggests an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and the link farm heuristic point towards a phishing or content-distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/123?utm_term=schwinn+varsity+1250+walmart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f8be31976d47.pdfIn PDF document text
    • https://xipinirobidojuv.weebly.com/uploads/1/3/4/0/134017625/c32a4b9004f.pdfIn PDF document text
    • https://fupexojor.weebly.com/uploads/1/3/4/0/134017307/nusefitenuvenajakij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f943a21e5273.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/54fc7fe9-80ae-43f8-a125-7c4bef079e5d/2538838196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80db1776-031a-4704-8b03-8f1e83999781/29768273718.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/dagalurubakiladodukerev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff97db7e-9d6d-4dc4-b294-06140d4eb7bc/muwaxufilolifanelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8ed81d-04a3-4e3f-9b85-9cd1f7400af3/lorisobagudonivigopexo.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/giant_crab_spider_pathfinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c49f4e4-ef3f-484c-9b86-1cb9a1033bf9/girenupoxibubarorejif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc3f4dd-90d8-4569-b1aa-7786e05721fa/nazazitiboraji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ac7086a-d02e-4c24-8406-b8855210ed36/kizepowajujunilejon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a223b6a-b01f-4f27-ae72-38aea701c71b/85719433630.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E0 5408 bytes
SHA-256: 13281493ef12d891bd144d766c5342b5bc2bbd459ec34a4014c3fc7284b299ed
font_01_sfnt_off0000c514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC514 11024 bytes
SHA-256: ea7a1082087e4c399c33eecd740eb2afb3c376ad8a9754e47fdf7c989021c8f6
font_02_sfnt_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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