Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d49ea1cdd78c721…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 20:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 929c3440e4d540ee20d749b69f2db84b SHA-1: f84cffa91bd7d0d90aa82277af1628cf4e8f4fcd SHA-256: 7d49ea1cdd78c721fdf925e8ed6f5be6726b8dd8e3a91a9bad98e6278c1dd52b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous disposable hosting links, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://kingcom.edesign.fr/gr33/web/uploads/assets/file/lurotogurafuwad.pdf
    • https://alusol-kw.com/ckfinder/userfiles/files/13282656813.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qn7r3lth0idmicf37ssouq5rn3/sakumiguvewanufudebelulof.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5513544730.pdf
    • http://autosklo.sk/pictures/file/rakaxumedikidipizojenobof.pdf
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/davapinupibojugidofu.pdf
    • http://mwbright.com/upload_fck/file/2021-9-9/20210909191835777364.pdf
    • http://designbeginnings.com/upload/file/41728863314.pdf
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/17590980204.pdf
    • http://multi-accueil.fr/ressource/site-image/files/22010543986.pdf
    • https://pacie.vn/web/uploads/files/6356876118.pdf
    • https://academiesutherland.com/userfiles/file/79630151626.pdf
    • http://www.tekkoo.net/images/library/File/dikozolixagewutis.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be92867181---jezijafujinajilorat.pdf
    • http://tucsokszekszard.hu/images/news/file/gajarupevimijirexijexeviw.pdf
    • http://ssaisarang.com/ckfinder/userfiles/files/43830552083.pdf
    • https://icoachyou.biz/images/ckeditor/files/92789252454.pdf
    • http://ilyxrace.com/userfiles/files/99384554295.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/newigepibubaruv.pdf
    • http://global-leasing-management.com/uf/file/49269581756.pdf
    • http://dajuicebarus.com/uploads/files/7428434758.pdf
    • http://cmtdental.com/upload/ckimg/files/14491485464.pdf
    • https://drjou-vc.com/upload/files/38772753630.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bus+simulator+mod+apk+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bab1.bin
1a21433554c4c0afc580c24257e5c4f9b07932653da74c5012335eabe8627bf7
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB1 16668 bytes
font_01_sfnt_off0000e5ed.bin
1a73972da4bc5bb1930d37daf9641e9b8c3b85045025ffd8b7af7dd62fa84007
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 10988 bytes
font_02_sfnt_off0000ff89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 16792 bytes