Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b1a102d036aecc…

MALICIOUS

PDF

77.0 KB Created: 2021-09-16 21:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 17217a12db7b9eb156e4e82db0b49ee8 SHA-1: 539e185c26bdbb0f20ed0a9acf9230e412ee3976 SHA-256: 51b1a102d036aeccb80c9460ced92c3069b5caba181455ad4531f1f6aa1dd79f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and potentially a trojan. The presence of external URIs suggests the document's primary purpose is to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://synerhu.ru/uplcv?utm_term=mi+note+7+miui+12+update PDF link annotation
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f249bba9e---ladosogafezozawavejefoxu.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/metanidisirugalux.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/66750927083.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/86219019081.pdfIn PDF document text
    • http://artdental.hu/editor_up/pasazoxobemaxinigudolis.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/1472075623.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/popevokawiwudov.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/22665144592.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/13321283644.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/94921698207.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/mixinosodesununinemedim.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/vufum.pdfIn PDF document text
    • https://jobtiara.com/files/files/7098542155.pdfIn PDF document text
    • http://fgosvo.ru/files/files/begifi.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/5038491213.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/72065085628.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/11648441715.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/64296505874.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/mukoletepabalolunakesik.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210915_170941.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/darulilutomuwobuparavi.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/kovalibenaguxikubiduto.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_off0000c83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83B 10556 bytes
SHA-256: d05fda59d742732de26e3407c1edd9fdb1f25457ce9aae8e59035d8bc26f2134
font_01_sfnt_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 17952 bytes
SHA-256: f1df2f6ce2e0fe8423c56bd0327793f63f9be054b3d2abd0eb2b91ccc1a20e17
font_02_sfnt_off00010f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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