Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20e1c2a01648c2e…

MALICIOUS

PDF

88.4 KB Created: 2021-09-08 21:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 27ed17beca064fc481ab5c8461cc4e40 SHA-1: a320fb9ff7b04c23165fc76b3db4690f568990b1 SHA-256: b20e1c2a01648c2e7d8657ed79ff78597afe59a0e2418f92a8536ff7a56907d5
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document functions as a link farm, containing numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of external URIs and the link farm heuristic strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://philabc.ru/uplcv?utm_term=manual+removal+of+placenta+nhs PDF link annotation
    • http://homeshopeez.com/uploaded_files/userfiles/files/42304319878.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/jafitoxowadiboruzib.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/zalikigekog.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/zegubumizumipijogefujami.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/33647134875.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210904001955.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/gutinepelej.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210907115222.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/lufigudid.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/47889496415.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/18653515052.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b656e1b19---tiwutekobuzejisez.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/kotuzutuxofobu.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/dusiku.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/25883081916.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fdc460739---bemibosit.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/7470903286.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/musisofitasa.pdfIn PDF document text
    • https://clubon.top/uploads/files/40611878131.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/livixox.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/wegogiv.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/dedinojijux.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/3370574680.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/12583520507.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/ropofo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 10812 bytes
SHA-256: 8d92ca272e90b9bcb0c64f5eeaf11cbf25ace113abf0779177edb44b72bf93da
font_01_sfnt_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 17720 bytes
SHA-256: 0293f4c5f6ca3f6683e3a0dea3bd1523f47f5f626a7598f8320e33dee332e4f4
font_02_sfnt_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 17184 bytes
SHA-256: 559fd6b39bd44d48dd9c3a796352e20e0c8672afb2bc02c5a3f1a6a9607c7741
font_03_sfnt_off00013b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1