Malicious PDF — malware analysis report

Static analysis result for SHA-256 7078670ba1fd4369…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 02:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34c747fa8e28f698405308f0cc882986 SHA-1: 4c8f058d5b277d70c641872e375edf379ebb2ee1 SHA-256: 7078670ba1fd4369ada476e5e071c277d3cc5de37232c518e63a911ee502f964
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. This suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jairdefreitas.com/ckfinder/userfiles/files/36159707021.pdf In PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/kedumuneve.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/welasusagijopazawokezejab.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/wivujelilisavusugijata.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/witakijugibip.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091206011438.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/96287445395.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb221bff28---29685124847.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613578cfbb84f---27341657293.pdfIn PDF document text
    • https://kawanmto.com/contents/files/piwukibivofezo.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89605327618.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/51077328640.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/tepumasibasavud.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/82599166886.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/vutiv.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/korotiwadukijo.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/94692282803.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/25320255765.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/52132441594.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/xuxiwukubevigolemazanafiz.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/56155506955.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11202739984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=vidmate+app+download+songs+and+videosPDF link annotation
    • 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_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 18468 bytes
SHA-256: e7a370f0d6b30701e24219fd3384d85f03d2db6261aac7a8041fa9ea238d17f5
font_02_sfnt_off0001240b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 10756 bytes
SHA-256: 6ae98bfffd0bec0e60bce644295f498d44fc4a06bafddc217427d63c713c5e67

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