Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4296dc2414dcee…

MALICIOUS

PDF

76.7 KB Created: 2021-10-13 17:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cb9921e8c4cd60b2ca8e0337a4c1f087 SHA-1: 9a4d9355707cb09185ad12f8c5f5126bad9e4a1e SHA-256: 9b4296dc2414dceec70cd1d82658d3a38f4089a72142b3f68d253bc109bdfda1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for phishing or distributing further malware. The embedded URLs point to suspicious domains, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=upper+middle+class+income PDF link annotation
    • http://indigobaby.eu/upload/files/fisezuravaxekafuzose.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/parejifobonisazafa.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/mimixalebokon.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/74559008775.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/nogodukotoxobijevuzifek.pdfIn PDF document text
    • http://myredm.ru/uploads/file/ledepaxu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/50c4b081719e740be4fab368a21077b5/zunetotosasiwujebu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145e11d43098---76016255870.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/12842948376.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc4db6f09---89302399789.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/jibimabijepusavepodawo.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/kopipepanezurunowewegolu.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/49356640460.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/53702872051.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/21251993634.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/73056937199.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/kujux.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_off0000c874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 10584 bytes
SHA-256: bec33f658cd4564d8e6517e63c6b9a92ce34455abef597c3d3b4d306edf9ab50
font_02_sfnt_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 17812 bytes
SHA-256: 7c4ed0f573709c7698eaab8e0f95d24587f46a62046f1691e5ca6222abca4108

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