Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b15466bef0789a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 19:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 190f0426642501dfd61ead2017e825e6 SHA-1: 7eae5674e35d9fd03fb6c29576974d6f282d7201 SHA-256: d9b15466bef0789ad1369000a2bbf214ea2e51ee6dda6bb4a30e75bc51e3a210
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document functions as a link farm, likely directing users to phishing sites or malware downloads. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://miydz.com/mingyi/images/userfiles/file/todewapetuteja.pdf In PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/zasoruxevowuta.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/tigunolibufavov.pdfIn PDF document text
    • https://jobtiara.com/files/files/7251496030.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/wiwomexegafavogazewe.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/buxadizogigegimufuxexowaw.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/15066515999.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/waromefax.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/65934222139.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/kesifonebifipuwekuz.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/diludizu.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/lorurulejomakonixulowid.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/nazufojuwufikadatebofe.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/suwagimiguronukux.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/ridobuzizaxog.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16140b907dcc81---89059737253.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/63792400957.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/34194246732.pdfIn PDF document text
    • http://agilesolutions.in/uploads/47795724764.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210915_3477BD015167C451.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/sosamaman.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/pusogizazigureterezipes.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/35934633181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=adobe+after+effects+windows+torrentPDF 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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 10632 bytes
SHA-256: 1eeddbbcfa11ed80f53efa9d4010c30ee8f0818bb7b1b4a33d9fa4689d131d58
font_01_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 17232 bytes
SHA-256: d39cf04e4239907e272e3a77b58891c7cf0cd1dfc98ff6d00b1698eb04bbdd34
font_02_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1