Malicious PDF — malware analysis report

Static analysis result for SHA-256 c053d2c4d02bc1af…

MALICIOUS

PDF

76.2 KB Created: 2021-03-11 23:26:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cca72e960e0712acd7d44ac07da093c6 SHA-1: 570f54e2c5eacb15ecdd1c4865cbaef3bd54dd63 SHA-256: c053d2c4d02bc1afe6fc755f1a8228b4e4f611186a073d5fb1dc4c77b8f4d96e
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 0.9993

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://jacksth.ru/123?utm_term=android+play+store+ing+forever PDF link annotation
    • http://bivisurat.22web.org/fesinijik.pdfIn PDF document text
    • http://ruvaruvifovuk.iblogger.org/metukovewuwed.pdfIn PDF document text
    • http://maxomafegafo.22web.org/xuxaxapililo.pdfIn PDF document text
    • http://begavarig.22web.org/wamujavuwavaza.pdfIn PDF document text
    • http://narelavupes.22web.org/nebojebi.pdfIn PDF document text
    • http://tibojisitixuno.22web.org/odisha_news_by_odia_reporter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vegiroromofi.rf.gd/96781116373.pdfIn PDF document text
    • http://diwedixeku.rf.gd/articulating_design_decisions.pdfIn PDF document text
    • http://sexikiti.epizy.com/padman_movies_counter_free.pdfIn PDF document text
    • http://tebuvarajeba.epizy.com/dudixupo.pdfIn PDF document text
    • http://jilovin.epizy.com/adobe_photoshop_resume_template_free.pdfIn PDF document text
    • http://xujogefup.rf.gd/77077694445.pdfIn PDF document text
    • http://vewomani.rf.gd/intergovernmental_panel_on_climate_change_report.pdfIn PDF document text
    • http://gifesikubelazu.epizy.com/nidizugadi.pdfIn PDF document text
    • http://tirimetepuxir.epizy.com/how_do_i_reset_my_trane_nexia_thermostat.pdfIn PDF document text
    • http://fovuwikotunepam.rf.gd/terakagiterituzatoj.pdfIn PDF document text
    • http://guziruxasa.epizy.com/punowimet.pdfIn PDF document text
    • http://ribaxekag.epizy.com/37156200403.pdfIn PDF document text
    • http://xavapofe.epizy.com/was_enron_unethical_or_illegal.pdfIn PDF document text
    • http://kokelegamud.epizy.com/nivis.pdfIn PDF document text
    • http://banitazivi.epizy.com/wilinatupewiseli.pdfIn PDF document text
    • http://ramasewo.epizy.com/rixaligarijoduweta.pdfIn PDF document text
    • http://fobonerenajob.epizy.com/serobuviluwamofofuro.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_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 5360 bytes
SHA-256: 8b0f26a497463634e3bdc6f271236e840ef1a270d253619263df74d3c96afcf7
font_01_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 10524 bytes
SHA-256: 7b96d58451be04de37ce0d60ac87d21dbd867e534c21daf7a651d99f02085bc7