Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07de9b02a78db9f…

MALICIOUS

PDF

79.0 KB Created: 2021-05-17 06:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dc9233f6a0c20f374f6aacf60801996a SHA-1: 1b9b9f7c12995b43e2aa473c472df32eea1b7530 SHA-256: a07de9b02a78db9fea9b2c8c0221e3ab4c2536038c14eb4ff751eda65614614f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=fundamentals+of+electric+circuits+6th+edition+solutions+chapter+7 In PDF document text
    • https://cdn.sqhk.co/lafuwexale/ihjXbDb/57136224767.pdfIn PDF document text
    • http://fegozerode.iblogger.org/64693071951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475382/normal_600663595e5ba.pdfIn PDF document text
    • https://cdn.sqhk.co/lawotivu/QIexMij/sell_amazon_gift_card_for_crypto.pdfIn PDF document text
    • https://cdn.sqhk.co/gagowuname/gjieMhh/jimdo_creator_vs_dolphin.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472479/normal_605f9938638d0.pdfIn PDF document text
    • https://cdn.sqhk.co/jiledexuda/2jbZ6cY/ant_radio_service_app_on_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464852/normal_604f7b442f183.pdfIn PDF document text
    • https://cdn.sqhk.co/rowofabuf/jebhjih/83950098237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_602517a67fe16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484993/normal_60125f3dc1343.pdfIn PDF document text
    • http://gijixig.22web.org/verbos_irregulares_espaol_lista_completa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_5fce7b5e07e31.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tejinumifed.epizy.com/sylvia_the_play_script.pdfIn PDF document text
    • http://gogaretafibofo.rf.gd/cash_flow_template_excel_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/19592634810.pdfIn PDF document text
    • http://sasugud.rf.gd/2948547523.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/rusobutibokulapiniwizuri.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/zawemowigod.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DA 2912 bytes
SHA-256: b3177c8de935bf2e05ba58035bb430970af2c83108b60a2dfb12b0772094c699
font_01_sfnt_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 1788 bytes
SHA-256: c1c3c68ffc476a5ee212591bf5202b316c985ff001535707c79a5509737d3132
font_02_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 5584 bytes
SHA-256: 76bff4bf5d3381b1c1c21afb2eb8694d35d0ca5d734ed54be427ed57f2437da8
font_03_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 10780 bytes
SHA-256: dc09fcde48ad128419a36990af15ce4dd9ad48abcc2b8d14d9e81ff7f1008df6

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