Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb309821d049e66…

MALICIOUS

PDF

72.6 KB Created: 2021-03-02 22:28:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2a2cbefb1693f60cfc31c929d762ade5 SHA-1: 86127a64dd958889e04bec50bdcc906ebc4a606d SHA-256: bcb309821d049e66ccbb730741fa9edbb208b7b02b311c6cad852c2c9d1d2691
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/123?utm_term=yas+207+vs+107 PDF link annotation
    • https://kenomixu.weebly.com/uploads/1/3/0/9/130969587/e7cede6839e9bdb.pdfIn PDF document text
    • https://xefikusog.weebly.com/uploads/1/3/5/3/135390274/7313556.pdfIn PDF document text
    • http://gatorama.space/z_score_table_2020dsqqa.pdfIn PDF document text
    • http://dalnoboyi.xyz/wipibaxegawewmwqbk.pdfIn PDF document text
    • http://dusosax.66ghz.com/miparebiveretikeruz.pdfIn PDF document text
    • http://mists.space/timolol_davis_drug_guidemxfri.pdfIn PDF document text
    • http://hotsales-com.xyz/wunejunalitolezozaxonkrrqy.pdfIn PDF document text
    • http://safagiko.iblogger.org/using_in_formal_writing.pdfIn PDF document text
    • http://shopeuro.pro/988729406600rk73.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/dusubonifu/2016_bollywood_movies_bestwap.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/giduxafovoxazibubibotuze.pdfIn PDF document text
    • http://vefagukolile.epizy.com/konica_minolta_c220_driver_windows_7.pdfIn PDF document text
    • http://fefisapuvekebi.epizy.com/intermolecular_forces_worksheet_grade_11.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/28533855351.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/71584941628.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/83573893758.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/carbonless_forms_printing_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/lusefogabitetavi.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_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 4976 bytes
SHA-256: 0886102bc109f55e1b562c820970491fa3d5bc19e193671ced6d5a347ded5b04
font_01_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 12140 bytes
SHA-256: 7d5d09dff74efd18fca3b95a0fa61e1cd2f0cf83ac603270c4e250a728f9d5d7

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