Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbf8595d1e877a5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 02:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 400831c154dcbe03decd8cb48d6b8ddb SHA-1: 1efa94a4ac8097a2369bbabcae972d868cadf400 SHA-256: cbbf8595d1e877a512ca91d3b4fcf975254ca80fe93bf27c7c1ef078302295be
194 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external resources, including one that directly points to another PDF file on a suspicious domain. The heuristic 'PDF_RANDOM_URL_LINK' and 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=what+channel+will+the+logan+paul+fight+be+on PDF link annotation
    • https://moulindelarroque.com/userfiles/file/62305950887.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/gixapakikopefe.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/77119495099.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/79470027334.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/10255844964.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/41924509667.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0i6cfkq7hu15135b8qbl579vr1/28982787142.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6112a3d698d396251a45ab489b801f4b/newodiruzinaze.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/valezurifotugijodeka.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/lutujukivisunarijoreka.pdfIn PDF document text
    • http://classtool.info/upload/files/dozaviwupe.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/xixumowobisuvokiv.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/dozubi.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/34307757407.pdfIn PDF document text
    • http://specialcats.nl/media/files/72444017286.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/mufasiroliv.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/kisemafu.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/vamuliduxigezasapizirabu.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/63068968233.pdfIn PDF document text
    • https://gameclub.by/uploads/files/fetego.pdfIn PDF document text
    • http://meta-min.com/files/begima.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/76966968648.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/16224601918.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/zizimejeguzibopaxufiv.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 17728 bytes
SHA-256: 15ac6245bc023391a8dd2cdde21c652a549bc0c85e647ab65bf6cf94d553949a
font_01_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 10812 bytes
SHA-256: ba1c6476dd46de99794396ecab148fc4d876f4fda96769c06b636cb86c75f0ae
font_02_sfnt_off0001229c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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