Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d66a656b74f5206…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 13:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72add589d28a69317e24e127b57da201 SHA-1: f79d44a8f51fee0ba7b497ebc604bfe0d84fde98 SHA-256: 8d66a656b74f5206110072d86a8b73e697b03ed30cfb0423eb2495d5e958ceac
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URLs, many of which are algorithmically generated and hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute JavaScript and redirect users to malicious sites for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=minecraft+game+online+download PDF link annotation
    • http://devveb.net/userfiles/file/ruzolizakesa.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/watetifofobekabuwunomuz.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/80846447417.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/powotarajizanajotizipa.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/14810021937.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/88456628752.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/7118732951.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/domaga.pdfIn PDF document text
    • https://lasanisports.com/files/20589309749.pdfIn PDF document text
    • http://abbaorphancare.org/survey/userfiles/files/79585431366.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/7573554900.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210917145344.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/xizomidevotenakamofoxesut.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/2146771599.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/zijuvasodoberasij.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/5599474003.pdfIn PDF document text
    • http://kdekdyjak.cz/data/josufurufel.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/4644293083.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/nolumutogedukag.pdfIn PDF document text
    • https://combrooncom.com/contents/files/17161686040.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/fexuxizejonelipemul.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/28095501755.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/91985547214.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/kelegudagur.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_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 10728 bytes
SHA-256: 9cfe0913144b48a0cd600f7170795e3517d3b4624bd1d2bc41a6e67a94cb484a
font_01_sfnt_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 17252 bytes
SHA-256: 2696d2b9ac8765e926d5e94fed395421aa561a999952f72e877741a747f6e2b4
font_02_sfnt_off00011ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1