Malicious PDF — malware analysis report

Static analysis result for SHA-256 c419c0832eae075f…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 23:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51d04e00ff79f3cff28ac8381e2a6f8e SHA-1: 15c1263839941275d10c64083a24cc1b4f4988f3 SHA-256: c419c0832eae075faffac4bfe6aea2d8b9c2f5f551e6b7ba5149793f728a3ded
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which point to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://moristas.com/userfiles/files/pakuwalulegivud.pdf In PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/19801211516.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/71283173750.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/20712952249.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/nigezaxifotu.pdfIn PDF document text
    • http://chpcentre.com/files/file/49472457237.pdfIn PDF document text
    • https://zzwgjx.com/d/files/17992632710.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447c068e5a5---tegodib.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/nubekaguxafilizudun.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/90348140248.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/28585438984.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/37303811228.pdfIn PDF document text
    • https://dacola.com/upload/files/22695788906.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/44258801559.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/xusopul.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-11/20210911111919754964.pdfIn PDF document text
    • https://filetorme.com/upload/files/xojuzas.pdfIn PDF document text
    • http://sissonne.hu/editor_up/69010930593.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/luxozuligazewisix.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/90583392823.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/42853517832.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/bixogetifapinakinekuga.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/lurafilatenagujepiw.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6d3846544---28268703969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=watch+my+hero+academia+season+3+freePDF 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_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 10976 bytes
SHA-256: d3742e483eb542d438d3ef1ab6748c01ae23b416aa6f7c896f8bc10a921930a6
font_02_sfnt_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 17872 bytes
SHA-256: 4fb8e69b205236c2baa49ba15f0c48ece35ddba1546844d82b8532a8fc98e304

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