Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf2946787208167…

MALICIOUS

PDF

73.0 KB Created: 2021-09-28 20:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fa1ba013e85949150347dad28d0f5c81 SHA-1: 082524c9b22e14e0e59d88012691eed915164eb9 SHA-256: dcf2946787208167b0014c226a3d0098c946f922ed2d01990624e6a395134d00
134 Risk Score

Malware Insights

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

The PDF contains JavaScript actions and is flagged by ML classifiers and ClamAV as malicious, indicating it's designed to exploit users. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm intended to redirect users to malicious content, likely for phishing or malware distribution. The primary attack vector appears to be a spearphishing attachment leading to a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/4gvmtuu3j6ap1sjdjn48m2gvev/3645740130.pdf In PDF document text
    • https://aventura-agence.lu/userfiles/files/26499685760.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/finod.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/vepeguvobude.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/nisedasuposalilorefipet.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/nofonazesuras.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/17265793221.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/13462741279.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/34445248656.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/dilanediwalegakigegeti.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/3257241285.pdfIn PDF document text
    • http://ewtch.com/upload/files/wuvoritororevarisukuwugid.pdfIn PDF document text
    • http://emannsltd.com/userfiles/84485273991.pdfIn PDF document text
    • https://vzglavniki.net/data/file/13844023349.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/35923896391.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/denedesagoxesovefuva.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/91601581125.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7b8df4823c7160721bc5dbe1e079db0b/50232104768.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/41893753717.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/58959366064.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/kowuwupimewomov.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/nodofolam.pdfIn PDF document text
    • https://ripedesign.com/app/webroot/files/fckeditor/file/77606920540.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/vinuzaguriroxivejurejan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+assistive+touch+untuk+androidPDF 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_off0000b931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD143 17412 bytes
SHA-256: 8027d49613a96d9f6a52315201c4a757274d3c828656f7d08bca836f0bbd106c
font_02_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 10812 bytes
SHA-256: 2be8e728b3db98b8f029abc7f3c4138b8a78b5f5e2b736c2206c19f94403cdf5