Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06e4e127800f761…

MALICIOUS

PDF

79.3 KB Created: 2021-09-22 18:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8180803dbfa245475ba8d93138eff54 SHA-1: 1e56081620b90ea0c08c3611964674b079c97142 SHA-256: b06e4e127800f76108ec2d7d32e768f783f51daf62ce3b6af20812bd3acacac4
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS firings, along with the ClamAV detection, strongly suggest malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 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.
  • 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://coretry.ru/uplcv?utm_term=free+word+app+windows+10 PDF link annotation
    • http://eprdel.cz/userfiles/file/87187748300.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/64521764575.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/2437339536.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/16064562822.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109102028072248.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/5752281500.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138db6a1f419---80521512176.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/suwina.pdfIn PDF document text
    • http://vodnik48.ru/content/file/ligaje.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/dopajatonujetu.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/solumeradedej.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/zusegagowo.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/12897088060.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/74092865434.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/96052644171.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/bilobu.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/28377795994.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/2157525756.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/25622146899.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/3042292111.pdfIn PDF document text
    • https://pmms-online.com/assets/file/vinufik.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/lorifamixu.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/davevi.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_off0000d41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41A 10476 bytes
SHA-256: e49eef4c68ece8b91fa1bae7978ed174288f1f9bf2b76bb0cf05477524cd4c60
font_01_sfnt_off0000ec09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 17028 bytes
SHA-256: ac42a2e81aee67de4a7315efc00ea79ce5394af5db762643aa282db735ba0ef8
font_02_sfnt_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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