Malicious PDF — malware analysis report

Static analysis result for SHA-256 82423121896a0ffc…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 10:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca214e16f31fc8f7a20e7fa80522113f SHA-1: 96d1f0b84c0f271e6217c0505e2bc6d67dc3ea60 SHA-256: 82423121896a0ffc32099cf4a163abd5ee921d109f74b736b2642ad6ca460ec5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, suggesting a link farm designed to obscure the ultimate destination or host malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

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 http://acecaalcoy.com/userfiles/file/27314883799.pdf In PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/bipefen.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210905122955759.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/foziwejaxir.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/77198817325.pdfIn PDF document text
    • http://klhl.com/userfiles/file/teruw.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/20621030780.pdfIn PDF document text
    • http://kasargod.net/uploads/file/depivolepaxizazupelajo.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/9814598134.pdfIn PDF document text
    • http://venkateshservices.com/uploads/58588903832.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/lijedob.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e7821b4f6e09942443d62e7cb2e4e26a/damizititafurejodozenikot.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/11765422371.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/limofuxavozibe.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/kekodurepekatowilisixug.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/47054636112.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/gabudi.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/60077986725.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/43372751452.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210910113140.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/metosanezoz.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/17161854425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+chat+app+tutorialPDF 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_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 17320 bytes
SHA-256: d85fc4e9ea5ac32849f9ae83600caa0d08eddb2660c8e9d1a387ffd66bf00610
font_02_sfnt_off00012835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 10392 bytes
SHA-256: 91bed79663521d11004a3e02b9a9b21bd056d845a93cfcc523f7c8dac16bb0ad

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