Malicious PDF — malware analysis report

Static analysis result for SHA-256 e071a7db8a35a3d1…

MALICIOUS

PDF

81.0 KB Created: 2021-03-25 14:34:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: adf94c80db52dd78e8fc2aa34b54cea3 SHA-1: 553cfe35ccaec4f45d8c9154dda56ed799b56402 SHA-256: e071a7db8a35a3d1536e06089b7201fb5a67b386d005a26d884479c91a766627
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 0.9994

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://crophysi.ru/award?keyword=aumento+de+masa+muscular+nutricion+pdf PDF link annotation
    • http://mklhhhh.space/baldurs_gate_dark_alliance_gba_manual5wres.pdfIn PDF document text
    • http://euroshopme.site/war_showdown_full_freeua5b8.pdfIn PDF document text
    • http://myfirstsite.xyz/bear_archery_cruzer_g2_ready_to_hunt_compound_bow_packageb3pma.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/87330000820.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/application_analysis_tools_for_asip_design.pdfIn PDF document text
    • http://hdvideo.design/golang_template_backtick4cmpe.pdfIn PDF document text
    • http://lastasked.com/gexemozakow5m1wo.pdfIn PDF document text
    • http://hookup750.website/nizedewede4vh3d.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/chapter_7_flame_cutting_quiz_answersse0w0.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/kufuvabimikide.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/jirelawogilaz.pdfIn PDF document text
    • http://mpvideo.org/the_birds_are_chirping_tiktok_strokekuoo0.pdfIn PDF document text
    • http://filopibat.22web.org/motorola_verve_buds_100.pdfIn PDF document text
    • http://nuveclovet.xyz/81325486519sfoz1.pdfIn PDF document text
    • http://zodoworusa.22web.org/middle_east_attendance_management_software_free.pdfIn PDF document text
    • http://roxedizusugu.mywebcommunity.org/which_sbi_credit_card_is_best_for_students.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuverojipu.rf.gd/flexible_dieting_lifestyle_pizza_recipe.pdfIn PDF document text
    • http://widifusi.myartsonline.com/how_to_install_offline_google_maps_on_iphone.pdfIn PDF document text
    • http://sowawobajomo.rf.gd/3221084482.pdfIn PDF document text
    • http://mezomiz.rf.gd/bills_bills_bills_sheet_music.pdfIn PDF document text
    • http://lemujiv.epizy.com/lanovupetuju.pdfIn PDF document text
    • http://zaguvigijosev.epizy.com/calendario_mes_septiembre_2018.pdfIn PDF document text
    • http://xazopufegi.onlinewebshop.net/daseruxivekugaket.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_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 5288 bytes
SHA-256: c4c31020b1b5ff425d89110f5e63c50d327c1176238a7ba21c6f61fbe8a242d3
font_01_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 13388 bytes
SHA-256: 0b786b7c9d05c6bdd8c52efb53e39f6d369e28253527157d477f7608d33fdf28