Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b89a4b5b888fd9…

MALICIOUS

PDF

73.9 KB Created: 2021-09-22 14:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89ea305a9ef5b63ae551ddc10ba9c569 SHA-1: 120185d44b1b756fa4cc77fb0b0be00b8b44d07b SHA-256: f3b89a4b5b888fd9c30a763706d4e2c70cc6d2f17d5ddbe6cd4a105cc460cc7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=dream+league+soccer+apk+obb+data PDF link annotation
    • https://trystsalonri.com/images/file/72760178481.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/buripu.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/892790861.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/84562543564.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/15111285529.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/06sv2cvcqfu1tosrp1jcs3bg86/42696540155.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/10965900886.pdfIn PDF document text
    • https://conrays.ru/f/data/dulabidefinaw.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/fuvojonuwusinubumepofer.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/64245952135.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/xijerilinisenak.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/jukupexujirixaduku.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/zewinak.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b566568b8e---xezufijejopizebuxavon.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/davekexirub.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210920000753_1879931036.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/jaburijogemigijiwukupopi.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/panivuzixu.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/vonewalisawuwurafuvuwexo.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/sotuzibinufisududatom.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/14141499182.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/62884212725.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/31400034299.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/48639642244.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_off0000bcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF1 16816 bytes
SHA-256: c53cd312af3ad752fd22a0ff3739d614a4e2b3a59fd1c9a48c4508171014733d
font_01_sfnt_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 10996 bytes
SHA-256: 6708e338eb18809fbacf127bdb86c5e1366783d765053a36216f1e41a8c33b7c