Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbc177136430f1b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-16 00:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2fb50a2a61f53d9b027a94e5b2a9feb2 SHA-1: 9d9575703f22f5dbb90f0957ddbf52f1ecf2ecf0 SHA-256: 3dbc177136430f1b8a4dda04a6b3ef6830e4ff1cecadd545f07048f8ea42694b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=harry+potter+and+the+chamber+of+secrets+watch+123 PDF link annotation
    • http://gostinica-domodedovo.ru/files/zigaw.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/petewijejugotiluriw.pdfIn PDF document text
    • http://bresky.cz/res/file/zabogu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0be447fc---41926283099.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/sigovobidosewedimaruti.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210912133031142091iy3dzv90wngd.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/10522002963.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d52dc0797e5e260d32fac7dd9beead97/kavunupixalonolejulajadup.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/61429951293.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/63815762636.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/wubudofamodosabisusu.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/68018995015.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/jofer.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/tolevosivapalamuwuv.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/78979875370.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/87781393724.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_off0000af84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF84 11424 bytes
SHA-256: d8f07de4b4a5ffcc6479db53a39906ab4fd4dd0939742b4da17f293b8425996f
font_01_sfnt_off0000ca34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA34 18096 bytes
SHA-256: 117a2c83afb6f5a04805b5c9c2cfca67ddba4f06097cb5f4a3c80d2b5befced9
font_02_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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