Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b269dba707858fa…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 22:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac4b4df3978f1719150dfe9707298725 SHA-1: 192b5bbd1edb4aeae120bd170fd711ace603b9ea SHA-256: 3b269dba707858fa400ede6762d8e67db668f1a0ccb0b9f6b28efe5b1c628b03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. Heuristics indicate the PDF acts as a link farm, containing numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=largest+country+in+the+world+in+terms+of+land+area PDF link annotation
    • http://huiking.cn/uploads/file/161149437977.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/tuwaxifuzu.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/wabifidasiwujezojinow.pdfIn PDF document text
    • https://ahha.az/userfiles/file/dilisagemozomipeke.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/raribituxuwevixe.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/pikilifer.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210916005329117.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/wadidukapidoxupozirupaxu.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210903203443.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/13753004374.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/54558040358.pdfIn PDF document text
    • http://beta-rc.com/upload/files/vajuwikolozunozug.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/54366498367.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/ridivokijexexazedogulav.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435260f26ee---zitalimudasapo.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/52841375840.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/8838507786136404b52e7e.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/faxepedelev.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/mosofudasixojufe.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/38699709322.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-04/7aa71f1818d7b0870d67729af6b078cd.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/61249192227.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_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 17804 bytes
SHA-256: e7a6654e69533f8e33a708c3e92570f3d2316f26a7c4aa337557cb68f400348c
font_01_sfnt_off000114b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCF 11180 bytes
SHA-256: cff0c7de97569acdd9add72b4ce0a6032eb122dd4506e49d05c9f245065feb25

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