Malicious PDF — malware analysis report

Static analysis result for SHA-256 001a2740f3a7b5d7…

MALICIOUS

PDF

96.5 KB Created: 2021-10-17 18:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d583915c2264767f2ee498241f67a7bd SHA-1: 872e05ec7a6f71dd2ece1f427f070b14bb7d8a05 SHA-256: 001a2740f3a7b5d7539e0a7bd4534384d418a6b66b77ab8cdbcf00fabcdd33f7
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are used in link farms, suggesting a phishing or credential harvesting campaign. The PDF structure and embedded URIs are consistent with malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=dr+thao+ong PDF link annotation
    • https://quatcongnghieput.com/uploads/files/69826408646.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/79089908852.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/16245279370.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/duzoporurugazo.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/danobejifebesaxovu.pdfIn PDF document text
    • http://techmechengineers.com/uploads/dabupiwixos.pdfIn PDF document text
    • https://o-dance.dacola.com/upload/files/88939725492.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/55856207256.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/dujigokinerib.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/rajigex.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/69532882237.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/22681476643.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/bonitofi.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/16407954781.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/46153960078.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/97456809959.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/xulegilexuluzogikuki.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/66912035682.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/4009385509.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/90675558234.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/pinizezuv.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/zanemiket.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/2548703476.pdfIn PDF document text
    • http://julianina.de/upload/file/3238725390.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_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 9952 bytes
SHA-256: 1e80414aacf88156e75dda16d9b1db3d4cda8bb99dfb6279ac55bffc46474a0f
font_01_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 22168 bytes
SHA-256: 18c84b6d29b2115951eef1e982c74948f3c85fdce40ff6e186c12318753c55fe