Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a86267ec8607382…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 22:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd3a7918146dc029696549e79a3fce3c SHA-1: cc0ad52c080fc0cae585fad65417d9b95e965a57 SHA-256: 9a86267ec8607382390d267be3a330eb30b9ea8df69a43935349a54ecbbe76ca
182 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a second-stage payload via the embedded links or a deceptive download button.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://interel-rus.ru/test/sites/default/files/file/62790969547.pdf In PDF document text
    • http://servmed.net/userfiles/file/34347384936.pdfIn PDF document text
    • http://qdcmd.com/data/files/xuzuxolameke.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/ditiparikitakagakozute.pdfIn PDF document text
    • http://tchid.net/userfiles/file/fodezivafotub.pdfIn macro / runtime command snippet
    • http://climtech.com/files/files/2195397316.pdfIn macro / runtime command snippet
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/38167549829.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/77597821161.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/31464657923.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/40011402486.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/kupeju.pdfIn PDF document text
    • http://ingore.cn/upload/files/zobevoperali.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/84630105211.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/22987081311.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/78020855785.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/kubidibojekuwatepur.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/bagelanekipinadogefafo.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/palodiwezitovimezil.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/75987073589.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/59088207527.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/76312140505.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/38162143050.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/bixazetuganolobunatu.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/giridulajow.pdfIn PDF document text
    • http://irk-yoga.ru/uploaIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+6+apk+downloadPDF link annotation
    • 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_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 19256 bytes
SHA-256: 0a5d641374b9ddddfac99d79f02253e6f9d6dec23841b5e409e10f89120bf85c
font_01_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 10276 bytes
SHA-256: 85f8f70b2c1d735ca1b8e1c935886e15dbcc9b38e77d28ad1cd02fff1a550744

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