Malicious PDF — malware analysis report

Static analysis result for SHA-256 df332ee9d96c6b65…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 12:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8eb0d55b0e269bac5db39bdcdc3aec4b SHA-1: f9d9c41b979c6bcbd94d79012735d5af19e90fc7 SHA-256: df332ee9d96c6b655d7cf2c04c870a202d6b2b131804c721ed5be8c95d9388f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://muachungbaohiem.com/uploads/userfiles/file/nafikifem.pdf In PDF document text
    • http://farashimirooz.com/files/42336404188.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/80704590543.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/tasopuxazisoxano.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/83868174272.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210922_072150.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/88014875339.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/deliteril.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/25269548960.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/lubuwebuwate.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/97387080769.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/tedalogido.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/zudik.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/73403439623.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161516e09ec55b---lopirefelifenotowoxigul.pdfIn PDF document text
    • https://tcremich.lu/files/files/30628826708.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/fugarifilerepilufijabelix.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/pawobebisave.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/jumegebolatanikivolap.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/gizuvonuramejeb.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jatorod.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021092808510782.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210909_191550.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/85675733806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tekken+7+iso+file+download+for+ppssppPDF 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_off0000aed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED1 15020 bytes
SHA-256: 73e0377d6f3d4cccc0ea62f8a2a7aada2f60de66ddf8d6f8df8637c9dcb1af61
font_01_sfnt_off0000d477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD477 10584 bytes
SHA-256: a7b714350c42b09bf4913409cb67562182e5d35f3a7163b65b3775d310c0b661
font_02_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1