Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdced99c4042abe8…

MALICIOUS

PDF

85.9 KB Created: 2021-09-08 22:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 868f77976fe53fd086ae729dbbcb729e SHA-1: 75baa0c91fa09dda6cb8634152874650f867876e SHA-256: cdced99c4042abe8709745d563d86bc623e2dd5ff70bbe1c5760d24e087dbe23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URIs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to lure users to phishing or malware sites. The embedded URLs, though many are marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://savitapiti.org/ckfinder/userfiles/files/matopak.pdf In PDF document text
    • http://interstroy96.ru/uploads/files/34250707668.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/putenejugumurise.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/76913943481.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/89293754036.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/87108075319.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/garolumetupi.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/xekerepi.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/30592742160.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/dutubepevafegifem.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/93899196161.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/20445902721.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210905_3D3E00F9C3C7864B.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/gigaloboku.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/61673722505.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161332a512c2c5---mugexejowodokizad.pdfIn PDF document text
    • http://ropesadventure.com/d/files/vakudipafefuzegezitagil.pdfIn PDF document text
    • http://spbi.cz/res/file/jegoru.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/folifur.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/majefoborebokopit.pdfIn PDF document text
    • http://machulski.com/public/file/88181669886.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/13678683420.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/12247689778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=prix+application+coyote+androidPDF 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_off0000e7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E7 10556 bytes
SHA-256: 440b95eab6bd48836723d7a5bca168aca34c786288563f8732c71a00e31e951c
font_01_sfnt_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 18556 bytes
SHA-256: a1e76c4896e56d874f9c4c550a98363984b6fcb7218d5a645e30f0e8f5d18632

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