Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed799ba6cd04e57…

MALICIOUS

PDF

81.3 KB Created: 2021-09-24 07:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c6d1a1cdeaa8af34abe3c214cb4ff84 SHA-1: c37796eddb8bc8e00b186ac17686c0b02c079e3d SHA-256: aed799ba6cd04e575dda72dcf021e92ebe1a0252a16dd2d62e074706102a6152
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to malicious sites, potentially for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crysiq.ru/uplcv?utm_term=mobile+legends+damage+hack+script+2021 PDF link annotation
    • http://sga.cc/uploadfile/file///2021092021133315.pdfIn PDF document text
    • https://bauarch.bg/files/xefat.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/28694469638.pdfIn PDF document text
    • https://fptica.ru/images/file/dapetimorelokutalu.pdfIn PDF document text
    • https://soechi.net/userfiles/file/wexujupipolisuza.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/nirife.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/46418687351.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/jurevedobiluga.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/rofefiwim.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1a9eedba---59237755752.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/19590438595.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/fobitokuwoniwaz.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/68206707091.pdfIn PDF document text
    • https://keongracun.org/contents/files/38924594445.pdfIn PDF document text
    • http://chongros.com/userData/board/file/ditizexagilasipo.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/zevijalaxurefik.pdfIn PDF document text
    • http://renknh.com/ckupload/files/tenefaxagegogadezefasup.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_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 11480 bytes
SHA-256: 40919f9c966d1eb5936be1fd0276df55c9c1755023155571f6f0eb1657e06bd4
font_01_sfnt_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 18616 bytes
SHA-256: 3ad910048a5fbde650c4ec0bea37e6130038225b17eeadd251ed54ad3030dcde
font_02_sfnt_off00011fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.