Malicious PDF — malware analysis report

Static analysis result for SHA-256 00dbd0a00e205a7c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 09:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39ae5684c9f8b7e66ccea2ce45e14550 SHA-1: d466ec7e924ae033bb2b11e6bfa711e1bd62929d SHA-256: 00dbd0a00e205a7c5b1e2fb7941e3f8e12fd32481dc0ee0b2396176aff879811
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded links pointing to various domains, suggesting a link farm or phishing campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a network of links on disposable hosting, likely to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=pubg+mobile+lite+free+android PDF link annotation
    • http://danguykhoidoanhnghiephp.vn/Upload/files/24653377724.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109130715580844.pdfIn PDF document text
    • http://nanopena.cz/upload/file/93833375155.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/69740982605.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/toraxenujujisatifubafite.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/kezulisuvexogusivome.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/gixokusovunezesunurolapo.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/56354100602.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/kixazejekajotofum.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/naralepevoxaroteb.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/5573421491.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/70831643615.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/37361602464.pdfIn PDF document text
    • http://bienbao.net/uploads/files/pawedinibawukigovatuk.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/muruleninetorelabi.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/givoridusirokezuga.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/23096326030.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/werifevowex.pdfIn PDF document text
    • http://lblussana.it/images/file/dibuto.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/binivawuki1631509972.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/fomivujoxepeme.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613764a84a71f---13361068172.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/26800833925.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/zoxoribe.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/719311974.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_off0000c4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DB 10768 bytes
SHA-256: 2b1b64f1ac1af5af5507a23cf587e97cb3dea34bd3b71b47605baf5d0d68cbd0
font_01_sfnt_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 21504 bytes
SHA-256: 9d6c2b39f50d9ec7fd1b910d8828aeb06812db6f984de4a102a891ebdb272101