Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede4371d2f751bb6…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 20:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ad9bcb24959e3932bf6484a31d5bfeca SHA-1: 46aa38282296e3927a2728bed7c03f1f0bc3f22a SHA-256: ede4371d2f751bb684ff25da6ca52cd2b3ea9614eb994b107e534afc0c9eba24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. No scripts were extracted, but the PDF structure and embedded links point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=open+source+video+editing+android PDF link annotation
    • https://dongciao.com/uploads/files/202109102336507496.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/nopil.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/8012586325.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/fudarebebewi.pdfIn PDF document text
    • http://onlinevay.com/upload/files/48932155599.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/dikedigolovelexokezo.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/80968863407.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/59243439537.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/14376395818.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/jatodez.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/sakuxepafoj.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/ririkisig.pdfIn PDF document text
    • http://geose.ru/userfiles/file/54752381895.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/5759546726.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/91564058581.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a19c6a86e---73460352807.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/60716453489.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/87555439279.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/zigejasum.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/30959509424.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/60654878979.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/gutizuweviwasovedewafa.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16150b292472c7---54710832334.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/sunavivej.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/15294480694.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_off0000af60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF60 10832 bytes
SHA-256: eb93d59a3a876ee184ae8dc174c154a5749f9392df63031d128b9085a458a072
font_01_sfnt_off0000c85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85B 15604 bytes
SHA-256: be14babb379a19f5aa0c09e3496e55cbd0311a45af4b51071fd3327639bdeb27
font_02_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1