Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc67697d7c138cc6…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 08:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b63386a2b905c7ea1428b757763a165 SHA-1: 0dbebb3ab9de28ff0b30724d1a2736f48cd76a28 SHA-256: bc67697d7c138cc6aa1cdaa31915f54633858168cd270b19e673a5e73c866585
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external websites, some of which are algorithmically generated and hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/tanupilefunomalifevodoma.pdf In PDF document text
    • http://notarius.jurist-info.ru/uploads/news/fckeditor/file/lawedovopiwejodadij.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/bikikasur.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/bamaletixow.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/tazabugirasamekosuze.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/simajedemovukaboxi.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/64245259022.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/tobawunetipifeze.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/bb9q16m9jko2se77qbcuu3fv77/numifubavumituloxawotizef.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/sulosinewolulimutovivu.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/lofufowo.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/ruxaxi.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/pawarefisimexotet.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/wovudafafuzugulidazoril.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210905070819.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/bomuruzuvaruf.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142018007a12---27830877225.pdfIn PDF document text
    • http://ropesadventure.com/d/files/wibabozisexaz.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/47927841259.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1631254154574378144.pdfIn PDF document text
    • https://bawauang.com/contents/files/fituvuboruvudalaj.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/14557729264.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/scJZzyHtpnXI.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/vosulivatoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=where+is+speaker+on+android+phonePDF 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_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 17708 bytes
SHA-256: 45d3fb3ffb8a49af673f9d412a2dadd36bce19f7969e54674259bac1eca447c1
font_01_sfnt_off0001188d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A4 10432 bytes
SHA-256: 59b68ecdf01418e6a19f2b65ceebe8b4e6b85f29260beb10c4348dc2f5031daa

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