Malicious PDF — malware analysis report

Static analysis result for SHA-256 6702d48b2f9962a9…

MALICIOUS

PDF

78.0 KB Created: 2021-04-26 21:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 44996e1b0f03a3525dc278d78f442c3b SHA-1: cd8ec3c0ad882093665c7630b9bc66ac19685983 SHA-256: 6702d48b2f9962a9f1f5c307b047366b56d33755ca2d5c0fcbf1146582336944
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=how+to+write+cfg+for+a+language PDF link annotation
    • http://gepavozo.mygamesonline.org/zodebilinav.pdfIn PDF document text
    • http://jedugefipevama.iblogger.org/6042811922.pdfIn PDF document text
    • http://fuwimel.22web.org/punjab_textbook_maths_class_11.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/kiguwimeturabis.pdfIn PDF document text
    • http://miromawetibikew.mywebcommunity.org/16484079266.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/jafujasiwetid/4265439258.pdfIn PDF document text
    • http://zexuxogawozujiz.rf.gd/1853915764.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_edd343286c7642e6881e550604201d3b.pdf?index=trueIn PDF document text
    • http://suboxasolu.rf.gd/vuxaxowufonaviganekutapu.pdfIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_a194420f858543b581fd03e5274f6b7b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/dudebinaku.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/34168318433.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/biohazard_4_english_version_apk.pdfIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_ac3294b2ae844bbf9e8ab0ab13f974cb.pdf?index=trueIn PDF document text
    • http://bisiziwaros.epizy.com/bacterial_bronchitis_treatment_guidelines.pdfIn PDF document text
    • http://muvemaxadal.onlinewebshop.net/centrifugal_and_axial_flow_pumps_theory_design_and_application.pdfIn PDF document text
    • http://fekugijofexoz.epizy.com/avenger_endgame_script.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_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 4924 bytes
SHA-256: a93940a1bacb9ac401a55092e03761eed9a19c6e69d375547180b727656f04b5
font_01_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 11412 bytes
SHA-256: 2be18c70fdcd9bbd1b29d347eafca64855a10f5ebaa18499ee480f22e18447bc