Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a7ae2a61221c2a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 00:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3a934f27e3790c57af209979c275af8 SHA-1: 12ddb604870e740d957126756c441aec0726d41d SHA-256: 96a7ae2a61221c2acb1396bfb072df1527fff58e7be5b966ed60453ab6d16f82
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts and links, suggesting a tactic to manipulate search engine results or distribute malicious content. No scripts were extracted, and the document body was unreadable, but the overall structure and heuristic firings strongly suggest a malicious intent focused on redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xtremefitksa.com/ckfinder/userfiles/files/58201435696.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614034a4a0833---49820504483.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/nukegajis.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/bawokikajo.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/73841218737.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/87207715974.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/44720715828.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/33407744292.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/tukavixanunanu.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210906015300.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/jimuzewif.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5463110492.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/vemazaxurisixutasetolomim.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/geles.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/1024148151.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/98328363676.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/poligizutovukez.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/62390349658.pdfIn PDF document text
    • https://ms01bet.net/contents/files/21526083837.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/41901038329.pdfIn PDF document text
    • http://otczenacts.com/media/files/80666344223.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/nijazodakamogomivufa.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/79578049639.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/26696942293.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/45372377747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+news+app+androidPDF 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_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 17820 bytes
SHA-256: c2d7eba776b21cccd5e17925884e4b4799089b111f43f76c61728c93998cc09f
font_01_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9A 10480 bytes
SHA-256: 405e85752ad9e56f7226565a806dc77d4af28cf236d7c52a6439bbe3d68d050d