Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22d500bd588345f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 07:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a7032441cc54931f52ae1f02a4589289 SHA-1: c0fc44d9dd9116ad9a925697d7a0dceeef2a2bcd SHA-256: d22d500bd588345f266dd5893fece1a34bad882d2c111e5d04317886710e0c00
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of embedded URLs pointing to various domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a link farm strategy, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=hidden+hotel+apk+mod PDF link annotation
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dopupusume.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vozevemulajibajidisasoma.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/xorozodunajo.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/luwomezitifutawamoju.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/70406236630.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/75713972602.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/vudakedupuzewupajir.pdfIn PDF document text
    • https://blokhol.com/upload/files/lalurojipodirozazinotu.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/85000702887.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/bibawevugoboboxovagad.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/werosoxutobuma.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/28642607665.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/47634124914.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/vobub.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/wigilemajewiselixiti.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/51363323220.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/xatodunusibi.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/46397201811.pdfIn PDF document text
    • https://cartolmania.it/file/57875755644.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca05a48a9---jibevu.pdfIn PDF document text
    • http://storemisr.com/uploads/files/pojovazelugaverutazak.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/mefavusawunaboxilara.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_off0000d1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 10472 bytes
SHA-256: 0766dc0e84b5f0ef34895bc520cb964694cc0659f8a939db2d10ca9faed855b7
font_01_sfnt_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 17496 bytes
SHA-256: 2bc6ff886e47d8f7d549d76b8101810ec9793d1da46c27d5fe972333e42aefbd

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