Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44e675e5708674a…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 06:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 361417aaf691672ecca1e1414f33ec4f SHA-1: a0d0de1990bf75feabb8bc1a4405fc5f999168a1 SHA-256: d44e675e5708674adc8aa8b4d39c6d628481beae95416d0f106dec79f4cca171
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-based design with a clickable action, typical for redirecting users to malicious sites. The document body is heavily obfuscated, but the presence of numerous external URIs, including one pointing to 'nomylo.ru', suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nomylo.ru/uplcv?utm_term=how+to+share+app+using+bluetooth+in+vivo PDF link annotation
    • http://tasarimak.com/ckfinder/userfiles/files/wumibixezebepunejug.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/lokajobebafavepakuvogis.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/vevunimamupupa.pdfIn PDF document text
    • http://home-plast.ru/foto/files/xojurotukowigule.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/sulipamozonafixosaxufagu.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/lavafopavogedorono.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/70862641417.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/disufelinaliloxifu.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/vogagiselosozaridewada.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/vevobotidavo.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/xumagune.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/dugesefipadaj.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/83628158235.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/luduluf.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/68385675107.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/ruxemafonumepoguxinukuv.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/19515139821.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/60551668576.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/nuwonemijigutabin.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/94610014200.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/60616025207.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/fetubipuvotegonurel.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f967e64d5a---gazabupipilu.pdfIn PDF document text
    • https://best-label.com/upload/files/18694575909.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/gonilesemudolafinulago.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/44546362796.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_off0000b51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51E 10912 bytes
SHA-256: af0ac51e049ec00439daac09be4f15751df453badac2f67800faa1e16e1e2769
font_01_sfnt_off0000ce22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE22 14276 bytes
SHA-256: 35825405a848085132a0c980045aa9dc5d357fc2a44b7028b56a9bfd21a0d360
font_02_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1