Malicious PDF — malware analysis report

Static analysis result for SHA-256 518ea0dcc7069b7c…

MALICIOUS

PDF

105.9 KB Created: 2021-04-06 19:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 02d7ca747860a9ad687443f4a318aa08 SHA-1: 88f09c2a7d5482b1eb6d47bab166643420b7e30e SHA-256: 518ea0dcc7069b7cbd2424d8f9aa01fd14e167b280a0bee827a30790197bfbbe
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URLs, with a primary focus on directing users to potentially malicious content. The PDF_SEO_LINK_FARM heuristic indicates a significant number of links, suggesting an attempt to distribute malware or conduct phishing attacks through these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/award?keyword=casson+fluid+pdf PDF link annotation
    • https://pidexijot.weebly.com/uploads/1/3/5/3/135316959/besepufufenufakulu.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/wenubolinuw-linoxuf-nofeto-rogofi.pdfIn PDF document text
    • https://kopusitubo.weebly.com/uploads/1/3/4/6/134698796/6bfd6b3ebf07e1.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/d03Kiio/88385493045.pdfIn PDF document text
    • https://cdn.sqhk.co/jovakuki/rYghXid/vuvidefup.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/how_to_live_365_days_a_year_in_hindi.pdfIn PDF document text
    • http://tryraisins.club/ost_brilliant_legacy_crazy_in_lovesy3ul.pdfIn PDF document text
    • http://sadovik.me/52665653641hz4mc.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/ensayo_sobre_cambio_climatico.pdfIn PDF document text
    • http://omshop.space/where_is_chicken_soup_for_the_soul_dog_foodmo10k.pdfIn PDF document text
    • http://item-get.top/baldwin_organ_schematicsvgbcp.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/falaxan-dafenokemu.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/hfnDjht/disable_voice_assistant_samsung_tv.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/xelimilav-lonapuvizi.pdfIn PDF document text
    • http://francobusiness.com/dymo_letratag_refills_white_plastic17wyy.pdfIn PDF document text
    • https://timurikamaz.weebly.com/uploads/1/3/1/4/131406182/5676814.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43e59f28-96d7-4988-bcd6-55bc25f76e69.filesusr.com/ugd/372bdc_daf0ca31a230470ebbdb0aca7f822702.pdf?index=trueIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_ed2a0100b9964add9568c21307f6ce4b.pdf?index=trueIn PDF document text
    • http://moxapowi.myartsonline.com/western_digital_my_passport_ultra_fr_mac_4tb.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_off00015b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3A 4844 bytes
SHA-256: 0e880b4f9fdd2a09fb65138c6acf210938376a31516463895335fecc72b140ab
font_01_sfnt_off00016bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BC6 13532 bytes
SHA-256: 5fc8b18fa1c47c55b58d3833e1d3bc0ebadf52d75ddeae09a8748da6a2f61202

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