Malicious PDF — malware analysis report

Static analysis result for SHA-256 200922801d124e2c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-11 08:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac1ec7fd1cef785819f13578309b60d9 SHA-1: 18614b948f59626dcb4294604b2fcac8f548ba2e SHA-256: 200922801d124e2c6ff9944d5c5e3f7f5fc9a0f227b436e6f1d0a9e1eeea9859
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable hosting and acting as a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier also indicated a high probability of maliciousness. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=gta+v+dot+apk PDF link annotation
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/77367017521.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/sewokipuliboxuvuto.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/xokexaludobujuvuwufen.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/suxevakisugunuziminabes.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/pawozixirisarajovudeza.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/49357064325.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/vexobumipajaraxobebu.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/47060340679.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-5/20210905223407757764.pdfIn PDF document text
    • https://digireg.li/upload/madifulurokorifodejoxat.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/fojixaweruj.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/93096087096.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/98139839104.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/52184322233.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa06eb50eb---52770983640.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/wenegemijaw.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d95bfa40---fitawuwozafawobomag.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/xutinojotuxi.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/josuvazikupes.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/51950089772.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/8046575349.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guravivifoxufuzexatun.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/43246097423.pdfIn PDF document text
    • http://koddous.com/userfiles/file/54857693285.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_off0000d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 17412 bytes
SHA-256: 209dd81261155a1233f872b3730aad05c0233956f4ec848c52f536ee09ec7a46
font_02_sfnt_off00011a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 9940 bytes
SHA-256: 6ec55b84ad5344e7b09166c763563693e297f66f037c046ddea8f945ab9d81c5

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