Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f6f3fd4810a124…

MALICIOUS

PDF

182.3 KB Created: 2021-04-11 12:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5c2a492fc3f424a9d1be2e9ff1bf5723 SHA-1: d89ddfb3a124875523354a5bbb6901a8557b3077 SHA-256: b8f6f3fd4810a1241b1697311cf345c7b66fc76ce9cf27e5744f55c7808f8208
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, contains text related to search queries, suggesting a pretext for directing users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://druttle.ru/strik?utm_term=what+is+the+main+idea+of+bad+case+of+stripes PDF link annotation
    • http://flash-sar.online/what_characterizes_adolescent_developmenttttcs.pdfIn PDF document text
    • http://supportcopyright.net/restriction_enzyme_digestion_lab_report_introductiond2hhz.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/jiicmgi/pegusazodagufovaniwo.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/sokamekil.pdfIn PDF document text
    • http://hayatevesigar.online/335946937846oem2.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/jjDjbic/nicki_minaj_husband_criminal.pdfIn PDF document text
    • http://idealslimitaly.site/63571565445o7j2m.pdfIn PDF document text
    • http://adv-workshop.site/bush_usb_bluetooth_turntable_-_whitew060n.pdfIn PDF document text
    • http://istlan.space/luzazuwepugovn03d9.pdfIn PDF document text
    • http://xasedogamif.mypressonline.com/cakephp_interview_questions_and_answers_for_experienced.pdfIn PDF document text
    • http://yandex-dostav.ru/824183937150x0sa.pdfIn PDF document text
    • http://koparikamoze.scienceontheweb.net/mikanibiwutelejirixedol.pdfIn PDF document text
    • http://helpverifedbadges.com/513066778444zrf3.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/bezorito/bioflix_activity_protein_synthesis_rna_processing.pdfIn PDF document text
    • http://wilukejukiroxu.epizy.com/school_improvement_plan_template_word.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/biopsychology_pinel_9th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/escape_room_app_answers_level_63.pdfIn PDF document text
    • http://gavuzolu.epizy.com/62578606274.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/rabipixijeliza.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/pathophysiology_copstead_free.pdfIn PDF document text
    • http://jovigatuvukifi.epizy.com/where_is_the_wps_button_on_my_att_wireless_router.pdfIn PDF document text
    • http://figigaketexelus.epizy.com/article_writing_format_cbse_class_12.pdfIn PDF document text
    • http://madepadejatutof.onlinewebshop.net/how_to_clean_dr.brown_bottle_warmer.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/596166974.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_off000292b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x292B3 5516 bytes
SHA-256: 792cf1c8fd8d3d6258cf12cf0c15e891aa8859261a950edf181fd64afbb65ae2
font_01_sfnt_off0002a551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A551 11052 bytes
SHA-256: 50d1f0295d33569220e33855be75183552d90ca0b69874f12e5ee07fcc778669

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