Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d41a16b6223957…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 20:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f09258df1fe1dfc7a0a24f92d919c15b SHA-1: 23a2107735749fbd99ff90967b9914cac671d49f SHA-256: b7d41a16b6223957ce6b32e7c12dc426b5e62bd311e9b2c0e4e6c861ac1dd9a0
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or scam campaign. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=dream+league+coins PDF link annotation
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161420a7a62c4f---35623459355.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/retewug.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/goxedisun.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/burewarigoroniti.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/15211112993.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/5058452308.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/lunibiguxudoxuwodotodejat.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d642748391---72684926271.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/duzetuk.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/38421618594.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/94881436384.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/27095136862.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/kokuwo.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/43620826519.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109160858449072.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/65498382058.pdfIn PDF document text
    • http://greenglobepms.com/uploads/ranoletarun.pdfIn PDF document text
    • http://grandfiltr.com/files/file/lekokokaj.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/71617682379.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/majexokolodebafoweli.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec78d91794---92254263296.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/38324909621.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/xifawokefutevanogedup.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_off0000d3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BB 10576 bytes
SHA-256: c2fa56a44f7102e3f39c4b6f798a70ecdc17651fdfa215530eb3d0d103388328
font_01_sfnt_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 21804 bytes
SHA-256: 3cc70ab867d2a514312f61db4da1d623adb93454d5d8937764074554f4be708b
font_02_sfnt_off0001254d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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