Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8a87d8ef82244b…

MALICIOUS

PDF

67.1 KB Created: 2021-03-17 08:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a3ea052f44864d92b4dba8c37e22ad81 SHA-1: 7c2108da064ee510d413a5e3deb86990f3d9e778 SHA-256: 7c8a87d8ef82244b1a0d009643922be4b650d96c9c74ad9b498050c2ec156fad
184 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure at 'https://yafferge.ru/award?keyword=bus+eireann+115+pdf'. The presence of multiple links on disposable hosting further suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=bus+eireann+115+pdf In PDF document text
    • https://cdn.sqhk.co/ligumorik/YLzhgoa/piramidilupunivazejefijep.pdfIn PDF document text
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/paxagilizifokal.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/the_one_thing_planner_discount_code.pdfIn PDF document text
    • http://tumibejum.iblogger.org/leaflet_template_microsoft_publisher.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/idXZeja/minecraft_small_world_seed_pc.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/8925778.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/9738199.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/VXfIC88/samsung_s9_different_notification_sounds_for_different_apps.pdfIn PDF document text
    • https://womerakuketuzal.weebly.com/uploads/1/3/1/8/131856195/8163831.pdfIn PDF document text
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/e89e82.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosudav/jfhejaT/zozilokemokapidoloronifo.pdfIn PDF document text
    • http://bevatijiwavefad.22web.org/2158597521.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/56018260726.pdfIn PDF document text
    • https://cdn.sqhk.co/tukuxiveg/gicFjiz/use_email_template_outlook_365.pdfIn PDF document text
    • http://gulidomirebo.22web.org/pebufewumijutapaxomi.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/tipo_de_cable_para_bombas_sumergibles.pdfIn PDF document text
    • https://ruxibudowivuk.weebly.com/uploads/1/3/4/7/134728491/9089165.pdfIn PDF document text
    • https://lerivifaladadov.weebly.com/uploads/1/3/4/3/134334847/xopereg-kapegomoruzo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://felawikemuda.epizy.com/logo_quiz_level_3_answers_by_bubble.pdfIn PDF document text
    • http://fujegite.rf.gd/anatomy_of_the_eyeball.pdfIn PDF document text
    • http://nijufunirel.rf.gd/pawulogeminugaxijureg.pdfIn PDF document text
    • http://kegigija.atwebpages.com/rokawanavopunupeboj.pdfIn PDF document text
    • http://wilaroxu.atwebpages.com/koxufinememaleperivi.pdfIn PDF document text
    • http://kujafugakare.epizy.com/time_calculator_mb_s.pdfIn PDF document text
    • http://degefoxovovi.epizy.com/best_picture_editing_app_for_android.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_off0000c9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D8 5228 bytes
SHA-256: 2eb0e5e4b58b5034b73fc3ab5972ff044b1c3e095b413ade400971d7d3279a5a
font_01_sfnt_off0000dbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 9936 bytes
SHA-256: 447c34f720e29ba140d1b5cbd4d5ad16333c8f76843967580c766898ab80d740