Malicious PDF — malware analysis report

Static analysis result for SHA-256 8218b1b01644e3ea…

MALICIOUS

PDF

73.0 KB Created: 2021-09-27 10:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 347b55ae28504cb5cfec5ec31628a00f SHA-1: 88bf8f6ac8b8a594fd30c4e8f4d0e4b287af63d6 SHA-256: 8218b1b01644e3ea069882de156bce94f2074e36f7096f51745a038dee15b14e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host numerous links, likely directing users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and the presence of many external URIs point towards an attempt to redirect users, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://floresdeserrezuela.com/aym_image/files/vazakefivikexeku.pdf In PDF document text
    • http://chizclean.ru/files/fck/file/85458604426.pdfIn PDF document text
    • https://ibericadearmerias.com/file/75851121636.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/89760270080.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/kukos.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/jusijinulasalove.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/61902240313.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a17e6c021f6743cf91ed812c5a271397/42157042208.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/3990730910.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/47169190424.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/vajitasaminitew.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/xudumenisewidojijefak.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/90009679073.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/bapidapefunogubafifozo.pdfIn PDF document text
    • http://reylab.com/userfiles/file/giritidoduzokogidus.pdfIn PDF document text
    • http://torgoborud.org/images/file/daxokofof.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/falogajogikoxubufidoguto.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/natazapizesitixeme.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/63847184638.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/mulawotepelepalowopimuz.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210911_082912.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/80372323273.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/woriworonunakakak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=composing+email+for+sending+resumePDF 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_off0000b604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1B 10872 bytes
SHA-256: 654f7f281bd2a755ebf2f66498d27b758c6119f5e7e4e06b552180c1e2dd5fce
font_02_sfnt_off0000e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 18364 bytes
SHA-256: 26d993f29b13a869cb94f7883bc575ff6db1fa2ec46ae187af16f20db96f0263