Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c603aeb1a763d41…

MALICIOUS

PDF

75.8 KB Created: 2021-05-05 19:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b7ea1dea18cbdd27d2d791de4f3b1dcb SHA-1: 2146a4fdb6cd9f66a3b97bb13497914d929d1126 SHA-256: 2c603aeb1a763d41225061a7674c144373eaa4db2ba5f2b3b78e31033680753d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=hampton+bay+gazebo+ii+ceiling+fan+installation PDF link annotation
    • http://lifeshop.pro/the_last_lecture_audiobook_free_downloadzysn0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_605b1b95dc788.pdfIn PDF document text
    • http://hookup757.fun/xulimenuvepaak48a.pdfIn PDF document text
    • http://newser.site/engineering_colleges_in_hyderabad_list0dxjy.pdfIn PDF document text
    • http://cookwellbakewell.com/star_wars_the_rise_of_skywalker_visual_dictionary_downloadscpmt.pdfIn PDF document text
    • http://xefijemav.iblogger.org/sifebitides.pdfIn PDF document text
    • http://fewizoge.22web.org/tedavajukimodin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426832/normal_602477899de82.pdfIn PDF document text
    • http://kasyanbeauty.com/how_to_fix_astro_a20_not_turning_ontwrgi.pdfIn PDF document text
    • http://ru-dev.xyz/jee_mains_online_2016_solutionsbclgf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_605f6b419dc82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505839/normal_600f3d8f575b0.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/memobofilenabon/black_male_long_hairstyles.pdfIn PDF document text
    • http://durunorutap.epizy.com/jaxurofabejumipawet.pdfIn PDF document text
    • http://tebexuvizo.rf.gd/gavufudiguvumaguxofak.pdfIn PDF document text
    • http://regigaxuwejizu.epizy.com/17112608682.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_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 5492 bytes
SHA-256: c15b110fb11682349acab61c8383abea4eef9ff6dd26233728e32b6c19c99c0e
font_01_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 10584 bytes
SHA-256: 339e918b281b0c10178007729c005b912e36e4227bc4d78f36d0e5ffc83e92ac