Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1ad8c8640a93d1…

MALICIOUS

PDF

71.9 KB Created: 2021-09-13 20:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4e801f02a446a38ffa01f3f7c0fc327 SHA-1: f70e3adca2e9c86a4475096c3e1c1abf88882fb2 SHA-256: 3e1ad8c8640a93d1197708e0481736d075bbee4da9dd8c4b5620529a8ba8d156
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and structured with UTM parameters, suggests a phishing or link-farming attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of these links as a potential lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://equalland.com/uploads/File/pomobilos.pdf In PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/sevodajurinijotedesokeme.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/53093351910.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/wisuxekumenadifu.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/bemixe.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/16543008829.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/bomuziw.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/jufawabivawuvivanir.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/tedofekenel.pdfIn PDF document text
    • http://palami.by/images/file/23789747484.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/gupajozusil.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e04b33225bf8c47e0646f62e1a1a6dd7/zizesobubixatavukife.pdfIn PDF document text
    • https://pellevah.com/upload/files/36995184046.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/91652899602.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/5109060761.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7381745c2---ludakenomeluvamofusolal.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/levuzixosalejadim.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/koraguwarufotamo.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/68433841350.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/93470640257.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/zimosabavizinarotemotitu.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/lufuratozodekakugubon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=speed+post+ludhiana+contact+numberPDF 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_off0000b497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB497 11092 bytes
SHA-256: 6d385769cb2476a53fe84f5e3a4c425484a13d63e0334aef38ab361e2c80492d
font_01_sfnt_off0000ce00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 16816 bytes
SHA-256: 447bdeb81d4bc28ed486adddaf89694d81e18c3a2413d11932eeea632ebf18d9

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