Malicious PDF — malware analysis report

Static analysis result for SHA-256 9161fea1ce15bafb…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 03:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d7a3718f5535744c1182dbf5811fb1f1 SHA-1: fed11ca5230e6c5df734bec7c4041b7fb80983af SHA-256: 9161fea1ce15bafb48d2ada666c9e7d845ec2ba9d77b16c833843e27d943c71b
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a lure to redirect users to potentially malicious websites. The presence of a link farm heuristic further supports the idea that this PDF is part of a larger infrastructure for distributing malicious content or conducting phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cructi.ru/uplcv?utm_term=comunicacion+no+verbal+flora+davis+pdf PDF link annotation
    • http://saothienemb.com/uploads/images/files/94091843693.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/430543236.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/41212835379.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/jafudunof.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161457607a2100---lijujazumijaruso.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/3435836057.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/84582602784.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/2758946294.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/53846765865.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/53980645465.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/83679816178.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/56978949985.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ba279ecdb863de4a5fc1e86c32d6894e/56946613273.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/27303470216.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/68866949767.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/nalirozegugixonete.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/vurexezisa.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/92885502454.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/15259325852.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/pamutij.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/61866264153.pdfIn PDF document text
    • 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_off0000afd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 16824 bytes
SHA-256: e569f5c00ca3ea4a44102d6b51c3c218786fb591f8403772f035dab448fac744
font_02_sfnt_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 11020 bytes
SHA-256: 35078a0edf8c53fb5f492c70c0f377230fd16a75af6e3654a54d9a4d7585fad0

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