Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d96b17f6e8e7041…

MALICIOUS

PDF

87.6 KB Created: 2021-09-20 08:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a8cbd793293297f13a7e36cf2a32330 SHA-1: 370b7db9d548855f5c7d1a26748d5a21aa5f5a26 SHA-256: 9d96b17f6e8e70415ca63f0af2a2f02dd34c6ced76790d8e14ce2d6d0cca7b58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, with the heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://defrokatilai.lt/images/files/vagakiwuwusutujidotegu.pdf In PDF document text
    • http://jiin-torng.com/uploadfiles/20210905184509.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/84199824675.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/fivew.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/20607902585.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/rogolerajilew.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16140fdf531100---lazijidowimibekokafexu.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/93528926684.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/pufuvesulura.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/zefegiwajalavokebove.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/80233324166.pdfIn PDF document text
    • https://apelhijau.com/contents/files/mezojabolitidotazugoza.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/25635021987.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/fupesebolade.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410db721628---pepujifikof.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/34287675668.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/lorikerilinizisuwuxip.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/walonesob.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-17-14-17-13-lW5Mrall.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109190625527556.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161373699b6507---25985932107.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/sopurekexubisodivajope.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/6073063328.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/95887856944.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/gijixus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=install+android+sdk+mac+brewPDF 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_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 19664 bytes
SHA-256: ef7a11eb29855b1882b85fd387cd26a25863047aee3c9814576a54500ce68474
font_01_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BC 10800 bytes
SHA-256: 6ad2f2b03c29a3978461302fcb981889ec5338008603f67467c941fa2ab70954