Malicious PDF — malware analysis report

Static analysis result for SHA-256 52852a52240f79fe…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 14:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a8261c2e1f1d83f45362931d430aaf2 SHA-1: 971ae452e863f0405f76c05483c45c2e1dcc9948 SHA-256: 52852a52240f79fe8ec6e857dc3c2e4572d7ee75cfb7f6fd37e0bc1faef0afd2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, suggesting an attempt to redirect the user to malicious sites. The PDF_IMAGE_LURE heuristic indicates it's an image-based document designed to trick users into clicking, likely to download a payload or visit a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 68 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://intersensor.ro/v2011/Files/fck_upload/file/durevigubojekun.pdf In PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/kanakofomivupatogoz.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/66885416269.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/4ca30097f0016e67b987703134c26df9/82534346411.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/tekiwezirijame.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/15222785480.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210919201808.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/19724486506.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631242089/file/lavijasewebovovafelofuduf.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/13788963887.pdfIn PDF document text
    • http://bubb.cn/up_file/file/xemodesurigoziwijew.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/81349581696.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/posubidugofofetidol.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/55762035138.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/4330504861.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210913025023.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/fojubasagavutavewodi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16147eeb73a350---sureduzemanumisumitizepos.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/78615937271.pdfIn PDF document text
    • http://ihdbd.org/upload/files/sijiwolakepenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=where+can+i+watch+guardians+of+the+galaxyPDF 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_off0000ae64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE64 11148 bytes
SHA-256: fdad9da811e82ab88729f730e5b5a2284ea465e9061fc772349d3a6b3ef099fa
font_01_sfnt_off0000c848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC848 14172 bytes
SHA-256: b1506fd896e9dd70b60c148523a00c7dfdbcdf45c9f8b25b4c6c9367bd2d16d0
font_02_sfnt_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1