Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a595b97a3f25765…

MALICIOUS

PDF

79.2 KB Created: 2021-03-20 03:05:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 39230a927ae9d9f8e64e202096b9f7aa SHA-1: efc7c53ba3a282182bcdee6b2e0ea8f139d0e240 SHA-256: 1a595b97a3f25765cc6043c700d32a1ceb471e7384908aa4e633d69737661b78
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links to various domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan. The presence of numerous external links suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or to distribute further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious intent to redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://mezovuduw.ru/wix?keyword=i+almost+do+lyrics+and+chords PDF link annotation
    • http://cpskras.website/how_does_information_asymmetry_cause_market_failuretnt58.pdfIn PDF document text
    • http://persequen.com/bassoon_sheet_music_harry_potterd309a.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/cjdTYSZ/63088360271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420244/normal_6035749103d7d.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/cjbzija/greenland_movie_available_on_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/pogadidotilu/hfpK2jc/100981055.pdfIn PDF document text
    • http://salearea.pro/12605238081i0dzo.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/29039409615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fd67978620fc.pdfIn PDF document text
    • https://cdn.sqhk.co/kugugofawaz/jermid3/fakati.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5fef6334a6bfd.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/xonavukavowegeb.pdfIn PDF document text
    • http://mnclassis.org/68644360619ftlm9.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/gn2hcZR/tennessee_titans_depth_chart_wr.pdfIn PDF document text
    • http://aycotoro6.xyz/what_does_the_digital_divide_mean_for_the_worldcgwcd.pdfIn PDF document text
    • http://power-guard.shop/91425725773m7dg0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480748/normal_5ffc97f83173f.pdfIn PDF document text
    • http://bukipumil.mypressonline.com/ruwatonij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepuwiz.atwebpages.com/accounting_conventions.pdfIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_08c4a7aa168449b68b033453f0537d88.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_a44a5eec59cd445fadc319953ec3f520.pdf?index=trueIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_5818d553d6a34b75a3b82254ab660fa3.pdf?index=trueIn PDF document text
    • https://c20a02f1-eded-46de-afbf-2d7328e03b26.filesusr.com/ugd/c6fd25_f3909e60384742f09975f852951a5d7c.pdf?index=trueIn 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_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 5216 bytes
SHA-256: b42ae27276b358f30ca406bea5cdd919dbdb8c2f6ba3f6bc2e46bf7713d8b645
font_01_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 10912 bytes
SHA-256: 8f011948d58628befe29484d51e36968896daa00968452613b18323258d7539c