Malicious PDF — malware analysis report

Static analysis result for SHA-256 716963c7ecc14d61…

MALICIOUS

PDF

86.8 KB Created: 2021-09-12 15:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dd6a41fe15a59f9a56836be7801d6290 SHA-1: d7a6388a9802c10369eb616944d4355817eedaa8 SHA-256: 716963c7ecc14d6142094b189e659db9f2ee3f330721add33b97fc54bacbec9c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The high-severity heuristic 'PDF_RANDOM_URL_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The ML classifier also flagged this PDF with high confidence. The document body is heavily obfuscated and does not provide clear textual lures, but the overall structure points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://secretinvitation.net/images/files/67510521320.pdf In PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/piwokoxolesavi.pdfIn PDF document text
    • https://olterus.info/contents/files/gerigurisetabujiladokiv.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/mulikoserimusib.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/89583677603.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/9845238927.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/47401117597.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/45435471931.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161381e9d14361---79578163673.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/47252089952.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/woresulikun.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/gamobito.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/81349674731.pdfIn PDF document text
    • https://parc-hotel.info/file/lutinapixosufim.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/lunoxomimagefu.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/tunumezemoduzananazeteza.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/balezu.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/vixiwabedenefitile.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/40484077771.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/12748107137.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/25519520642.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/22689288861.pdfIn PDF document text
    • https://capecoralliving.com/media/file/favedawuzomebojatelugepu.pdfIn PDF document text
    • http://innersolutions-uk.com/file/dosogeravabuwojopenonin.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/memal.pdfIn PDF document text
    • http://co-mit.com/uploads/files/7872646615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=free+instagram+followers+likesPDF 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_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 10712 bytes
SHA-256: db681a89fb6069a1adfc6f521b427bd901d0cb91b1a60877ab0520d64ae93f65
font_02_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 19024 bytes
SHA-256: 7911fac9738471448acfc95352676dc74ec4a8c3c94b908482486d99f1c94637