Malicious PDF — malware analysis report

Static analysis result for SHA-256 2afd4ac2c40b3658…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 03:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f91c9a19a840e63b7735d438a89f98f0 SHA-1: 9f550fd551d0366098762d152a16a6377b95e5a4 SHA-256: 2afd4ac2c40b3658a800ada5fc984a9e5e939f1887252db141ee11f566c5fcc0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many on disposable hosting, suggests a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=the+robux+code PDF link annotation
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/53467006622.pdfIn PDF document text
    • https://razredna-nastava.net/files/vuzib.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/rawajawiz.pdfIn PDF document text
    • http://showpelec.com/data/file/20210904_175554_208.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/98750044707.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/2783383810.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee37575c57---wodewojinewota.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/wivujisiwise.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/4225218617.pdfIn PDF document text
    • http://africareview.in/userfiles/file/603004262.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/luvanukokev.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/negubasedapijobutuwujiv.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/69976607280.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/84467695940.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/nofob.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/82831463222.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/14260341280.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f08e55ed86---derevusodafasole.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/ragaxefelativosawigow.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/89006534399.pdfIn PDF document text
    • http://viettruss.com/upload/file/paviparaj.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/xewexo.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_off0000d2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 17356 bytes
SHA-256: 610af6987c858c9c370f00290e50ad3aee239bc7c7748fafb405198a47fe045f
font_01_sfnt_off00010038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 10104 bytes
SHA-256: dc0f75981a2712a2c2b24322afb20434a15f8904ffad505eeb05820dad689bc6