Malicious PDF — malware analysis report

Static analysis result for SHA-256 490f1a37a2e1a16c…

MALICIOUS

PDF

88.3 KB Created: 2021-09-10 09:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65ad0a6270c3b9c7597f88a8a8ba74da SHA-1: 5518887f35d27f2d2ec65b1e5b9ab027c3613f26 SHA-256: 490f1a37a2e1a16cb64c00122ccffd36def35c43b0d48f04dce21c5943d0bb25
134 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.jindatunnel.com/up_files/file/vutunemafujasib.pdf In PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090309222848.pdfIn PDF document text
    • http://foodchemsino.com/d/files/54233610438.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/11127129449.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/zufewaxemiwirafigifa.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/fobaroruzezademolopowuzas.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/tugupitorenubigawoso.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109061131585406.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/bebufadin.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/dawunuxafurawibu.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/80332831912.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/nirubipatewob.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/zubozevineno.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/kugafibupebuxana.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/sogoxuxometagitogodo.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/58852046086.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/senulaporelexagiti.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/89859143695.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/64145598079.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/14g395cu2bb9avmjl46d5ebkt6/fituketelulazenubanaku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346006080bf---5448708383.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210904085419.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/desaruxegi.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/61262145563.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/89006800717.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/xifadosaxel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fifty+shades+of+darker+full+movie+free+download+mp4+filmywapPDF 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_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 21484 bytes
SHA-256: 0912530c8f64ebcbd04fb781e3f7890cccab645579dd5ceebc44906ac1af1ebf
font_01_sfnt_off000120ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E1 11276 bytes
SHA-256: 0236bc769426ff5c719a51e46282b1c5c98168928653c53944c0bd3fa9deebb6