Malicious PDF — malware analysis report

Static analysis result for SHA-256 852ea38cb319a3f8…

MALICIOUS

PDF

97.3 KB Created: 2021-09-16 02:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc8983dd5d7fc1167109af4e74adc8e9 SHA-1: de92fa97281466af8d9882c330a533672584ecc6 SHA-256: 852ea38cb319a3f80d77e072efbfb62816167e059c383eb6054208e9a6abf758
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs, such as the one found in the document body, which is a common technique for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=pixel+experience+s8 PDF link annotation
    • http://ngocphuocjsc.com/public/default/ckeditor/files/xedof.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/31057628879.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/17759696806.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/14848605384.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132080a677af---91309199611.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/18723650719.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/watotobufasijo.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89034670725.pdfIn PDF document text
    • http://hijoin.hu/editor_up/39323887811.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/99633068601.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/letubivaparepem.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/67640665672.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/ketanefobova.pdfIn PDF document text
    • http://bankerz.in/qpic/files/sabiled.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wafuwilitofevakiberabuzi.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/jamuwatafoleb.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/zijenezazedetazalebox.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/67215333654.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/pofisagogosizoxikanud.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/65063197206.pdfIn PDF document text
    • http://klhl.com/userfiles/file/64360746927.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/79497229605.pdfIn PDF document text
    • https://mcsfood.com/images/file/kafemepedipagofiwuxili.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3285c6a7---98229006387.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_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 21080 bytes
SHA-256: 4fd31db1505d0a4460a6e5ba5a7601cee18f4de5327e3615510949702001e39b
font_01_sfnt_off00014848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001605f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1605F 10296 bytes
SHA-256: 272b5630be41ba02facb97a4c909c25cadee37c138dfb486dd1260ff83844ed6