Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd09b51db0bfd522…

MALICIOUS

PDF

94.7 KB Created: 2021-09-24 00:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4dcdb08decd5b6c75bc3b5a955af9b92 SHA-1: 126eff33e2142ad9f285cb91923e9dfd0ed93691 SHA-256: dd09b51db0bfd5223ec7b6d3d1d24449a177912c1a8775dff7aed11281fb9b27
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or spamming operation. 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 0.9935

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://krisoc.ru/uplcv?utm_term=pokemon+go+fake+gps+joystick+2020 PDF link annotation
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/wapefababemivolusodebugoj.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/bisutewojuwujuwerex.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/zupuwonowubunabo.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/7152106191.pdfIn PDF document text
    • http://ifap.it/images/file/kamubomuz.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/57318857828.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/rasetup.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/reduzegad.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/kanejosewevujokidedejok.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e98c79b2fb---96072904791.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/lakebisov.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e2f4353c7---famuribuwewubin.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/35831979158.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/zofavekozuzubixuwus.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210919_089417B871CB4ADE.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/72876671380.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/fedenepogolobise.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/93387959250.pdfIn PDF document text
    • https://0900107678.com/upload/file/kunowigoru.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/15410970157.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210905134709.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/66904911087.pdfIn PDF document text
    • http://herve-coiffure.ci/files/vulusisuxonolifubavo.pdfIn PDF document text
    • https://windscrm.net/files/file/70469702387.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_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 18668 bytes
SHA-256: 01cea11dc652bceef487391cba52ee2e57e82c82711a75fcf4806f7e4e959743
font_01_sfnt_off00013aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAA 11256 bytes
SHA-256: 0f513a248efce9ba4cc1e58f591263b24d02d0bc8ef21d891c0b47675e1530ca
font_02_sfnt_off00015539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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