Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1aaba2a4ee612c…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 00:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f09472e9e68be70b690374f0d56c9d55 SHA-1: 7ac1bfb939e64d5bf791801a0f0d9cf16a667b31 SHA-256: bb1aaba2a4ee612c2b14bcb6d1232f9c19390c62e571f31d379e05f738366057
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a strategy to obscure the true destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection signatures point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://taiwancy.com/app/webroot/userfiles/files/20039522910.pdf In PDF document text
    • https://medosojewellery.com/userfiles/files/zogevamevofibovolebovanez.pdfIn PDF document text
    • http://hrudolf.com/userfiles/60361567964.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/60294332348.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/mowamal.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/tujotururaxun.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210921_14E773C93A62C08D.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/75208798438.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/ranikaxenenogaserurutemeg.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/18026941496.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/95877630390.pdfIn PDF document text
    • http://chinalabware.es/d/files/bofot.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/99883092330.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/sajumutovatajoke.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/gedavedoxiz.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/fufejaxofusexavemekev.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2ce1f714---jumobabigobimiwagewuxakuv.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/sebamuwa.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/kufujasetabimufinevurusow.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-22/20210922155727267218.pdfIn PDF document text
    • https://aayams.com/userfiles/file/75173384248.pdfIn PDF document text
    • http://thaide.org/userfiles/file/fopujisiz.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/5978036521.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/xukugoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=two+and+a+half+men+watch+onlinePDF 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_off0000ae4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4D 14524 bytes
SHA-256: 6d80ae7b4f97c43394c5e66a593c81f168bd175836254e9cd028e690c7ff7e76
font_01_sfnt_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 10524 bytes
SHA-256: 88f067de69b2339ea234e34dc8ff2c8c93de4d3994d416dbf6405c7762a8fb9a