Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b21115df4a2680…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 06:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34903956382e216587c6afc2ef774e4e SHA-1: 83a45c94c52a397ddc1ef4a33f4e1ecb839a2d04 SHA-256: e6b21115df4a2680e083d7377c95861ace5542948dca7749f8b701a409c8d63a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=file+manager+for+android PDF link annotation
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/lupadijenu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138965defd9b---61633495552.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/taruvuneridato.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090623005114.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/88193318069.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/pafubarewore.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/lupinevojudonor.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/84117751131.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/40494262485.pdfIn PDF document text
    • http://toroisg.com/public/images/files/bomikolesenokudavilel.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161353b42795ac---zevafojitabogaxa.pdfIn PDF document text
    • https://yifff.se/userfiles/file/muwogefileluliwedotupubep.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/72162479895.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/54110776825.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/37449034265.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/63906876493.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/fonebusaxasisoxedu.pdfIn PDF document text
    • http://hflchw.com/upload/file/67364019456.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/vovenadudikipabifexuwetu.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/46108162257.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/55726982476.pdfIn PDF document text
    • https://gencatakan.com/upload/file/todafeb.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/xitebajadapazoda.pdfIn PDF document text
    • https://bloc-immo.com/images/zikivutovezigeg.pdfIn PDF document text
    • https://dom-titan.rs/files/65962626203.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_off0000cedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 17780 bytes
SHA-256: bd20da95d8bcf3b22b33eda5cbbe3cbd002fc32b946fbcc92f9de7cf39fb2926
font_02_sfnt_off000114da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DA 10408 bytes
SHA-256: 5a4e00ed5ef4a2563b05f3f1529e899ff57f191a2e77dbbf4b57e67924ac825e

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