Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b120bdd166e96f…

MALICIOUS

PDF

69.6 KB Created: 2021-09-12 15:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 237fc366ca8fa516b2d71ef0a0046cc5 SHA-1: 882a8da00bf158519fced246b86f085457b3f4ae SHA-256: 90b120bdd166e96f8f064db3301306399620e9db28463e5421a81e6d71771d84
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggesting a deliberate attempt to obscure the true destination or spread links across many domains. The presence of many unknown reputation URLs further supports this. No scripts were extracted, but the overall structure points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://iasvn.org/Images_upload/files/27001990069.pdf In PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/ramefa.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/pumigefi.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/tisakofozozumopol.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/fasegobux.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/kavogararebepunusej.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/lirikede.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/76400447405.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7bcf821ff---89715295686.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/39808735282.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/kabojozojumobumu.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/38989822968.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/52931427016.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/81774881243.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/56244175859.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/dotabujoninekusasos.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/kikajituxemixarubagab.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/xibijob.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210901161735.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7238b1962---bofajum.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210905230330.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/xawepivujani.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/jositanagevix.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/tarafipokevuwavitewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+image+pickerPDF 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_off0000b26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26B 10616 bytes
SHA-256: e5a96124e79e10c9f31a90b9d7f63b325b523e84d90ca03ff90ef1289fef17c6
font_01_sfnt_off0000ca68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA68 15168 bytes
SHA-256: e636bbf8de670249af73e6045505b77067fdf6fb2fe10779f5dec2492b79fc70
font_02_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1