Malicious PDF — malware analysis report

Static analysis result for SHA-256 676abae50678879a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 15:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bfb1fac8626bba2a01d7f9da94bb8265 SHA-1: 7200de822424218c7c59cfd505976e51b3f31fa5 SHA-256: 676abae50678879aa74778c5a3122b8af171f496cd6419adbb63405b1b17c636
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure to execute commands via the clipboard, suggesting an attempt to download and run a secondary payload. The presence of numerous external URLs, many pointing to potentially compromised or malicious sites, further supports this. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://www.medic-pneumolog.ro/fisiere/file/xelaxikisinelutomamaxiju.pdf In PDF document text
    • http://www.jnvhardoi.org/ckfinder/userfiles/files/xuvilara.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/56553822275.pdfIn PDF document text
    • http://www.og2c.com/images/file/56612886297.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/jakegomutebetusiwalolinap.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/sikukefulusevodaduwazasu.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/lokemogemewanimiwi.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/4808551415.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/fizokupunasexoguw.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/jipobujalo.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/39494714724.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/90630254097.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8068ed27---mowuzax.pdfIn PDF document text
    • http://trubaopt.ru/content/file/magolizudobalukagozo.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/7282048292.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/67439243602.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/juridolejubutarikebirakuz.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popegaduxudimurumesimap.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/majapabetunarovenuxinezik.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/3375463144.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/10536000250.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/92262369090.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/62586086658.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613428710879a---lewufalozajak.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/84541234171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=windows+7+full+update+isoPDF 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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCE 10620 bytes
SHA-256: 94aa111c0dee71af69025909a06a7724ae32c4ee9aa62cc0e820c1e02f4ee47d
font_02_sfnt_off00011652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 17748 bytes
SHA-256: c0fa90d192c269bca94e036c1a9dcf24271d5b6a929dd116e54b2dcd914e8617