Malicious PDF — malware analysis report

Static analysis result for SHA-256 6caf5feb34f62fb4…

MALICIOUS

PDF

71.2 KB Created: 2021-04-09 08:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 310fdec4b36209c44bcd291ea19300e4 SHA-1: 754a84affc547e4568b2111165a07569b7685fda SHA-256: 6caf5feb34f62fb413cf6e2df79387157606aa33604db0f36ca9937c3b8cbdcd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by ClamAV and ML detection. The heuristic 'PDF_SEO_LINK_FARM' suggests a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing/malware. The embedded URL 'https://soxebez.ru/strik?utm_term=how+to+fix+call+forwarding' further supports a phishing or malicious redirection attempt.

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://soxebez.ru/strik?utm_term=how+to+fix+call+forwarding PDF link annotation
    • https://cdn.sqhk.co/bebumila/ja5R3ji/xiligapixilisokaket.pdfIn PDF document text
    • http://artdebug.site/viwuduvorimujuzoc9wh.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/1ggB8gh/46756470457.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/hbhghac/insta_story_art_maker_for_instagram_storychics.pdfIn PDF document text
    • http://leopards.space/diagrama_de_flujo_de_proceso_industrial_ejemplogx3tz.pdfIn PDF document text
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/9675526.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/jfggeFV/pets_word_search_printable.pdfIn PDF document text
    • http://zagozogenef.sportsontheweb.net/what_black_movies_are_on_netflix.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/69257110284.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxixixixi/cRVtMjg/arabic_fonts_free_for_windows_xp.pdfIn PDF document text
    • https://cdn.sqhk.co/kusonemap/hifHeBN/11034793763.pdfIn PDF document text
    • https://nuzilemuf.weebly.com/uploads/1/3/4/4/134479477/zabibiwigi-jixasafate-jasuvuba-duriviranu.pdfIn PDF document text
    • https://cdn.sqhk.co/pujimuxuja/vhhqLAd/bare_knuckle_fighting_championship.pdfIn PDF document text
    • https://kojezuduw.weebly.com/uploads/1/3/5/3/135326104/da9f0a0dd9a.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/solonebosop/luxepejumagebafufavajiriw.pdfIn PDF document text
    • http://rabelame.atwebpages.com/gojoxararukanogejuneli.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/gce_o_level_chinese_2012_answers.pdfIn PDF document text
    • http://relivoziz.atwebpages.com/diesel_electronic_fuel_injection_system.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/uc_browser_mini_handler_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/accountant_financial_reporting_job_description.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/que_tipos_de_bandas_musicales_existen.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_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 5132 bytes
SHA-256: d66f53f7ce31e2b0fb6fe26a69e8ea9a96dc25984317ec5b05c72d0cfde91a28
font_01_sfnt_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 10508 bytes
SHA-256: f5e22112a9084113e60a1d6cad075d55581046304e22717f16291e21c1d0fabc

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