Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea44b381539491cf…

MALICIOUS

PDF

88.1 KB Created: 2021-09-21 03:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c00bd7d67afbdb14758d223959778ba8 SHA-1: 36609c437fa1798e64d69673b15a214a5f815304 SHA-256: ea44b381539491cff32c241b03f176b9506d133c4cebf5a3c4b40a966f830daa
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs, many pointing to potentially disposable domains, and is identified as a link farm. The document body is heavily obfuscated, preventing a clear understanding of its specific pretext, but the overall structure and heuristic firings strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://shopinhome.com/ci/userfiles/files/wibipiwosikolula.pdf In PDF document text
    • http://jandenzobv.com/image_uploads/file/99460116815.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/55886777269.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/gl5gdpf8i8u1505glrj1ag6nh6/zalonodijotojesu.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/39403647356.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/navaxugifasasajowajuvuki.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210915_150821_9289.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/7185679156.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/29861550603.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/wonunotugatuxajat.pdfIn PDF document text
    • https://blv.by/upload/editor/files/rizosojisifegogoda.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/63690256269.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/xabob.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/wojenasogowozivufopu.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/91427268110.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/sofinimixusuvasaxotedus.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/xelodarorobetewowoson.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/daluwomog.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/pasijatibum.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/69333776658.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/worapururaruzilij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+site+to+watch+indian+moviesPDF 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_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 17444 bytes
SHA-256: 11785e4feb2ea73f827d88c81ade60fde081a088b3ffe840d880547c5cb17384
font_01_sfnt_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 10696 bytes
SHA-256: b14c410fed3538f58d23d6f8cef282840c0e01dec3782b4a7eb6d3ae0d3291e2
font_02_sfnt_off00013aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1