Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5db4b6a66950db9…

MALICIOUS

PDF

79.4 KB Created: 2021-09-22 11:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed76b3c2c3565a0f309f314d86c790e2 SHA-1: 015a6a1fe137f151a9a1ec501766cba7d21bde00 SHA-256: a5db4b6a66950db92369302c94419ba37ac65163b3fdf30d55499c718b2dd367
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and PDF heuristics strongly indicate malicious intent. The document contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic specifically identifies it as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful websites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 4

  • 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://turnyras.lt/Files/file/92876338568.pdf In PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/vuwenipovu.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/muwuporapi.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/1644334801.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/46201099943.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/legan.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/zibigun.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/12480386050.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/fokakexipo.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/juvexerokasebunel.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/zufoguzivofupuvevuv.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/rilis.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/nasebuwirowu.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/95694770321.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/80738746940.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/fifutefemo.pdfIn PDF document text
    • http://lovesenergy.nl/file/11534406242.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/tufopujezotegenar.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/fezozunu.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/fotibususugimujigiwu.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/10775534823.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/fevuvifexorowifatagozik.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/wareregesu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/72504964456.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/nawumonuwisozudajagegoju.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/90564539972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=f1+2016+free+download+androidPDF 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_off0000d24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 10604 bytes
SHA-256: b4201cd0df09a892fc8ac051dded0f88615488670cb4ad8285a278635d36d703
font_02_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 17144 bytes
SHA-256: cc7ab577845928a87c0966bf035012319e0bddb98132d3362286998a08e4e1e7

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