Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8a7856deff7698…

MALICIOUS

PDF

76.9 KB Created: 2021-03-09 01:04:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 92529f0d9ead118c126fcbdfcd4e9bfe SHA-1: 57abedfd3d15251b42645d9101f3ba9bb281158a SHA-256: 8a8a7856deff76981d72c23c794a809c8ed6f3deaad6ff24165a27c1ddaadf40
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that these links are intended to lead users to malicious sites. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=cyber+security+research+papers+2019+pdf In PDF document text
    • https://rusudunan.weebly.com/uploads/1/3/2/6/132681855/zapojexudane.pdfIn PDF document text
    • http://tramlaweq.online/santa_clara_unified_school_district_superintendent_salarynnvnj.pdfIn PDF document text
    • https://toxisejaris.weebly.com/uploads/1/3/4/8/134851702/b318437afbc0c77.pdfIn PDF document text
    • http://pet-guru.shop/tuzobotexedixongt.pdfIn PDF document text
    • http://grantmedica.ru/beano_comic_download6ys0o.pdfIn PDF document text
    • http://pop-marketplace.ru/bedingte_wahrscheinlichkeit_aufgabensy1j0.pdfIn PDF document text
    • https://famexowizesiz.weebly.com/uploads/1/3/4/3/134359716/pemalefujabaxotugu.pdfIn PDF document text
    • http://pesale.pro/lalusazovivoxasawolo1zht5.pdfIn PDF document text
    • http://indital.space/identifying_topic_and_main_idea_worksheetsg1p8u.pdfIn PDF document text
    • http://srakan.space/54508766273vmipo.pdfIn PDF document text
    • https://tajewarupimef.weebly.com/uploads/1/3/2/6/132681391/rejilat_venab.pdfIn PDF document text
    • https://lefamadagizid.weebly.com/uploads/1/3/4/7/134704745/111468.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/wezabegol.pdfIn PDF document text
    • http://betmoy54.com/computer_fundamentals_for_beginnerscnc45.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/lista_de_verbos_en_ingls_en_todos_los_tiempos_regulares_e_irregulares.pdfIn PDF document text
    • http://front-glass.space/ripafafbfi59.pdfIn PDF document text
    • http://uscreditreport.info/radododorisasudizevdvta.pdfIn PDF document text
    • http://pegijegur.mygamesonline.org/how_many_trades_can_you_make_without_being_a_day_trader.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/vezumobigodub/adguard_2._12_250_premium_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/sas_stat_software_free.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_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 5840 bytes
SHA-256: cd78f061261774e5dc0f21c7753ee88dc71e1159901adc8c11fb4b143439574c
font_01_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 11004 bytes
SHA-256: ccb23caf50e0a32710a5a86fe4403c5c7f8ee2c762a46914a612db24be8a1bb3

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