Malicious PDF — malware analysis report

Static analysis result for SHA-256 885277167af66b01…

MALICIOUS

PDF

76.4 KB Created: 2021-09-24 02:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2670d7bc3a7db6ba2b78eb9e7bd2cc9 SHA-1: aca227ce05718800d7e75a78a29fd5fc0723a8a1 SHA-256: 885277167af66b01d90d9fe59ba53c9e3f6a265c89127a67e49d46dcca6ab5e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URLs, with one identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent, likely to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://childprotectionindia.com/lexcyberia/userfiles/files/82287998192.pdf In PDF document text
    • https://thaodienland.com/fckeditor/editor/filemanager/connectors/php/temp/file/2524813067.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/36200066601.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/jovomi.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/15208159995.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/relekalugumefisavit.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/dekiporimasufodomabutosa.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/wuwikizajolep.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/silipuwawumabavoguduwe.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/58284140160.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/jowadowovupijupis.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/43774795885.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/54995308700.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/bunedunapexukozap.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/53003353338.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/jesekifode.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/xezazutipixubimesad.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/36584874154.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210905_210231.pdfIn PDF document text
    • http://czyxchem.com/upload/files/futegubujofukeli.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/mixep.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cfd4fa764e---fesulugomadoxe.pdfIn PDF document text
    • http://yibetter.com/data/files/tutisivexupejenudorexukus.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/zulebowunap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mortal+kombat+x+mod+apk+2018PDF 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_off0000c2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 17896 bytes
SHA-256: 3ada9dbbe3c98d5f51a751f47c0e01a7502cb90c40b6dd5723e38cbd879aa00b
font_02_sfnt_off00010965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10965 10888 bytes
SHA-256: ce7efbe46964362f0d17891a59a8b3a63c1a082244b570dc3ffd8ceb55eeddbe