Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6be4c07a83a6b0…

MALICIOUS

PDF

75.0 KB Created: 2021-09-15 15:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98c496215a54b7b034ff45c1e039512b SHA-1: 001a652995de0fbba071fbe2a2353ed279c58218 SHA-256: bd6be4c07a83a6b078fdf2321bc39e3c44334b3bd98b39ae082b6c02608ad3e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious workflow, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://garglob.ru/uplcv?utm_term=among+us+zombie+mod+android PDF link annotation
    • http://bjavc.com/filespath/files/20210902093511.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/83270994944.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/tegeniparitovisal.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/060133582765.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/mamekot.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/84202995833.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/23345886592.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/52869587001.pdfIn PDF document text
    • http://annabarons.lv/files/files/4791222690.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/tojojotirum.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/79205497832.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/78164738168.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/37806596319.pdfIn PDF document text
    • http://renknh.com/ckupload/files/28400493749.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210903121415388002159nsi.pdfIn PDF document text
    • http://kisito.com/userfiles/file/49475118935.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/42263716199.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/fijamiwekawi.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/lafugesujisaxife.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/91386473815.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133c4a497d3e---rupodiwupalotogum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC364 10728 bytes
SHA-256: 2c8aa5b38ca1ac5f32ac5b85e6e52f780eaa6bd14dcdfce899577900bbb3ce26
font_01_sfnt_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 16432 bytes
SHA-256: 8079803eee0d550b40da442207745a7269d30f7072bf04a9c76e64f56d904986

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