Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc409781c43d67fd…

MALICIOUS

PDF

100.2 KB Created: 2021-09-23 09:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 37a2fa925d824c6ca3ff1c817e5f4621 SHA-1: 4cf33eff4547f2a1caab27afd64b008e3aa57f0d SHA-256: fc409781c43d67fdad12b7f2ee61e84c216286befb6e6e76249125d79f445a6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic indicating it is a link farm designed to redirect users to download sites, specifically mentioning a lure for 'download windows 10'. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL points to a suspicious domain, likely serving as a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://wastran.ru/uplcv?utm_term=download+windows+10+32+64+bit+full+version PDF link annotation
    • http://ain.proximeo.com/ckfinder/userfiles/files/61676573384.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/fasires.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/28208036344.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/tonijolekidowedisufujoli.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/niruwinavupegasemitatemo.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/59444945377.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/dupuvexoxopikusad.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/lujoxoxivejugirewa.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/57398262939.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/31200758038.pdfIn PDF document text
    • https://equinox-e.com/upload/files/mupipegorinuwugov.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/37189786609.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/57373950250.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/3317401035.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/damadizubewerubonabulip.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/kebunumidubexuwaduxava.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/1067778320.pdfIn PDF document text
    • https://kuepancong.com/contents/files/fikonikesebokumoto.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/vuputevevevezowesuwozupor.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/30193595631.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/50408534008.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109042010075041.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/naxesemajuwono.pdfIn PDF document text
    • http://acelybio.com/upload/files/48250652048.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 11452 bytes
SHA-256: 9208eea0a23ee49467b4f614fc9916ec5e7a2a642b79fea09764b01f612bb0c5
font_01_sfnt_off00010dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 28176 bytes
SHA-256: 34ae8d6446a9d8bcaa559db85eed02eb25a2ab8f2e0d07869252aeba349b3082
font_03_sfnt_off00016c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C4C 16252 bytes
SHA-256: 0295fde54f33375e71b312635bb5aa3d847439f716fa23b213b1a2a317692eea