Malicious PDF — malware analysis report

Static analysis result for SHA-256 e537873c45767c29…

MALICIOUS

PDF

78.3 KB Created: 2021-05-17 02:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 305eaca19e0f47d84d959332d90f2be6 SHA-1: 4cd44b5d89d7d1576593cabfdf97f4a580aa9ff0 SHA-256: e537873c45767c293e4f076d9e7069c1f3473468b246120dd1a744f2813ca0b4
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed and point to other PDF files, suggesting a link farm or SEO poisoning attack. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/strik?utm_term=canon+ij+scan+utility+mac PDF link annotation
    • http://flipping-car.online/what_prompted_european_exploration_and_colonizationp0zqx.pdfIn PDF document text
    • https://jirunemopisitex.weebly.com/uploads/1/3/4/3/134332051/8c00fe6dc5.pdfIn PDF document text
    • http://povar2020.site/bathukamma_naa_songs_2017bjh2q.pdfIn PDF document text
    • http://servempieza.site/wigebij6des.pdfIn PDF document text
    • https://nevozijefase.weebly.com/uploads/1/3/4/7/134748823/kovotibilubokez-jatefexub-migugotenan-pixevopokiz.pdfIn PDF document text
    • http://fionainthefield.org/36100806288dy1uc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_605c8760ebd8a.pdfIn PDF document text
    • https://kukibutojiw.weebly.com/uploads/1/3/0/7/130775835/dupuxavoxefu_lagigewig.pdfIn PDF document text
    • http://instapriz.online/how_do_i_use_my_bose_500_soundbar_remotem8bet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462681/normal_606123f400568.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/la_odisea_resumen_corto.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/vatukoribujugofiworutes.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/ship_safety_management_system_manual.pdfIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_9d03c362a70040e1b15853ba803e9262.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/24710420883.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/paint_shop_pro_free_windows_xp.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_9112958639cf4afa9414f39e0f08e73f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/56042362281.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/p90x3_workout_times.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_dc0a006c441f4c1392568ff936a4540b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/patozuwemomojifu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 4932 bytes
SHA-256: 9bc89bba21412ea277c0d9ddb8c0b0cb9bf32268d4d07a0cdf8b398017b177f3
font_01_sfnt_off00010474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 11256 bytes
SHA-256: 529c8386e8a8e4ddc695b0f98d02524c56ea1d04b905f2dbe3919ac3d2bfc684

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