Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcebf3576cab43be…

MALICIOUS

PDF

74.8 KB Created: 2020-11-18 01:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e164b1b620a8c7859551c450960640c5 SHA-1: 9374366f244871c3ea2714eb77f470d91d5da1b0 SHA-256: bcebf3576cab43be08ea97ba8784b6b7e2cde1554b6afa2cde1b5c866472a12a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://trafffe.ru/strik?utm_term=amma+name+images+kannada PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483089/normal_5fa6d828efefc.pdfIn PDF document text
    • https://popekuzukije.weebly.com/uploads/1/3/4/4/134471955/zesexegaxalix.pdfIn PDF document text
    • https://gedolenolab.weebly.com/uploads/1/3/4/6/134634008/3170515.pdfIn PDF document text
    • https://fotijaxak.weebly.com/uploads/1/3/4/1/134108731/9244091.pdfIn PDF document text
    • https://rogenogenitel.weebly.com/uploads/1/3/4/3/134316557/masomepofani.pdfIn PDF document text
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/4723893.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/rotizebokakojelu.pdfIn PDF document text
    • https://mikudone.weebly.com/uploads/1/3/4/3/134370159/4638005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5fad567c74f36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f8722c98d8c8.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/7830214.pdfIn PDF document text
    • https://loponulofaxoli.weebly.com/uploads/1/3/4/3/134324484/7757120.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
    • 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD11 4668 bytes
SHA-256: 681a7b94b4be93e7b7a8c85601c5e5e88655c9af83ef7e1c6ccd01a3bfbeaec3
font_01_sfnt_off0000bcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB7 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0000c813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC813 3344 bytes
SHA-256: 8396167647c488a8093a4e8de3a2f0182f3b102353c6428377650ea85722eb92
font_03_sfnt_off0000d469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD469 10944 bytes
SHA-256: c356a273ec1d010a4ede8120aca348b74d577e845c5902063ea29132719eccfa
font_04_sfnt_off0000f9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 16268 bytes
SHA-256: 34f393951a2d3db0d762c31d1ca698e177a53b7a5969336fa652e3f935eaa1ee
font_05_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34