Malicious PDF — malware analysis report

Static analysis result for SHA-256 177189fed44624f5…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 15:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 774b32db55d28e61850269d3bf14d9be SHA-1: 6cccceb5ee176c2b8123e70ae5d7de5b181b2c15 SHA-256: 177189fed44624f59c1deb8b95420c2afafeac6f47e9fc60ae524fb928e81265
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, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://beauty214.com/uploads/files/202109161635014171.pdf In PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/89073395476.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/vitejinodakojorij.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///jotalorot.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/divetepefajinamerudorugi.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/32905980397.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109020357569294.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/69763146120.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/44449367400.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/15196007809.pdfIn PDF document text
    • http://ropesadventure.com/d/files/dajosogojajedibe.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/36937634697.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/17f738301e82bf77ef491f70060c67b7/96867741046.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/susixogomonotiputolakaja.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/wezilejalasadigikeparib.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/46519917414.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/21112556705.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/xusonupifiterer.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/kvp1eg569mf1h9gaicsevl5jr3/jewufamukekitawoxis.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/17869760306.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/berazumovogufub.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210910/2253044860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+check+android+screen+resolutionPDF 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_off0000d4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E7 10736 bytes
SHA-256: 16edb5663b231fd678a4a43ac3d9d6f2bd8b562df2fb21104860f2190e5f7427
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 17020 bytes
SHA-256: 90bb8bc26d8a88808c3c521047bee56da1b6735b900e2003abc420798adefd98