Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3bcb6e04da0c18…

MALICIOUS

PDF

75.0 KB Created: 2021-02-17 10:25:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 62bce506c5852dd7a0d35425df07b177 SHA-1: 963ca492c96b6ac82183aded08e7b2bb42372bf9 SHA-256: aa3bcb6e04da0c1874dfad9191b046ad78ee767b7ac4452fa93ef6b84b4ecd36
244 Risk Score

Malware Insights

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

This PDF file is classified as malicious due to its function as a link farm, directing users to potentially harmful websites. The embedded URLs, such as 'https://crophysi.ru/wix?keyword=avast+cleanup+apk+activation+code', are designed to exploit user interest in software activation codes. The PDF structure and numerous external links indicate a phishing or scam attempt, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=avast+cleanup+apk+activation+code In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481400/normal_6009bd403b2ee.pdfIn PDF document text
    • https://rovisudaguxu.weebly.com/uploads/1/3/1/4/131438800/417753.pdfIn PDF document text
    • https://waxagenejefud.weebly.com/uploads/1/3/4/7/134712445/bumivaxilasezilos.pdfIn PDF document text
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/08c48d.pdfIn PDF document text
    • https://jizanisa.weebly.com/uploads/1/3/5/3/135386656/kefusisu-dasutu.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/Okgjd4r/national_civil_war_battlefields_in_virginia.pdfIn PDF document text
    • http://pedrons.space/standard_of_excellence_book_2_clarinet_pagesa5j0q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380395/normal_5ffac17d59ffc.pdfIn PDF document text
    • http://dvigatel.guru/186935649697fbc.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/IjigjUL/the_columns_avon_by_the_sea_restaurants.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_6011d097bd5a9.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/Hgf7jjv/igp_manager_cheat_engine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_6018e968a6b19.pdfIn PDF document text
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/fawitonufiz_dajewumiparirud.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/jbTJMij/pafopazisofoxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 5084 bytes
SHA-256: d2894c396145be25652413339fcced9f20c407591080d0fa6d7f3348b7b6dcd8
font_01_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 11644 bytes
SHA-256: cae95dbfb518194957762cc33efb4f343beed46813cff117271cdd9db2b8ab30

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