Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc10bacc9ac615f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 11:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bae4b2132ee566d37b40cd2c970e699d SHA-1: a4acdf1174822bdf0bf6277648e75770d3bceb4a SHA-256: 7cc10bacc9ac615f867bce59e4bf0a32fcd187be0c905227052f2b3e2b998469
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=how+to+cast+mobile+screen+on+laptop+using+wifi PDF link annotation
    • http://perevodvnegiloifond.ru/pict/file/84062018407.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/zabajironoxejin.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/31804282947.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/41931279407.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/dagun.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/nejukotizukawab.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210902134633.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/45299695384.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/77714204675.pdfIn PDF document text
    • https://mimpishio.com/contents/files/45510463698.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/45585082453.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/zagirip.pdfIn PDF document text
    • https://edusfera.pl/upload/file/46103136011.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/3062583728.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/12406664487.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613566da183bc---napabel.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/miwom.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/zedovorob.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/waxabonotuvibofofenabevi.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/79331407523.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/16826949641.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/90888154601.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210918_568695AFA700F22F.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910090022.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/riditasafugifaxolex.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_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 17804 bytes
SHA-256: d66f99de38a66cdae89304db96ac98dcd512abdd05a1df910984b43bc90b619e
font_01_sfnt_off00010227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 11140 bytes
SHA-256: 6b8491e2087cf453c3b891dabf506d04f59cfe87375ddbbbda5b5ac73ec60977
font_02_sfnt_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1