Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b03574d63b65c9e…

MALICIOUS

PDF

93.0 KB Created: 2021-09-24 08:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8509d408e99a01b2de0d2ac69fe5626 SHA-1: 7752c8e943b079fe76d2a403860ef993632e01b2 SHA-256: 8b03574d63b65c9e0b64cebc0d4309ff4c48c2cbfc8f6fc359c4abf7bbfc1791
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document contains numerous links to potentially disposable hosting sites, aiming to obscure the true malicious destination. While no scripts were directly extracted, the nature of the PDF and its embedded links strongly suggest it is designed to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://ceresasrl.it/userfiles/files/25796879637.pdf In PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/xokusuworipoveguvitu.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/89629b9752a88b5a1b9a36ab89dff618/wedilakuj.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/94031248541.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/54403943355.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613db50f73a2d---vorosipuzedabanol.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/fijabuziti.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/xuziliso.pdfIn PDF document text
    • https://dacola.com/upload/files/47424870806.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/85202766561.pdfIn PDF document text
    • https://subhagataguesthouse.com/userfiles/file/femepilujeroroxosukoradif.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/3451237468.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/88499016817.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/gewod.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94b6366bb---19638476984.pdfIn PDF document text
    • http://apple888.vn/luutru/files/71648831284.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/masipitutevujerumuv.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/18881716054.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/bubager.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/pebumemuwoseta.pdfIn PDF document text
    • http://polipack.ru/content/file/jowub.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/patikiwetudajasemewetufib.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/40835223385.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/6191604065.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/wuxifawogutul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gun+war+swat+terrorist+strikePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 16840 bytes
SHA-256: 637f282a09958e0217b626fc4698b4d72005eb4dad7007e6f209d5e5c10a4ef2
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 17564 bytes
SHA-256: 3c43e092bd1c38d93977a0bff233e995450aa19f34619fca1b5c7a31798f9639
font_02_sfnt_off000135b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCC 10372 bytes
SHA-256: ea25ae3f033eabf46b4650b3983332040f423b570902c1c56b2a98e2c1ec1e9e