Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88d286b8ce33a62…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 19:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9fd99594bfefe565006363d63dc4cff0 SHA-1: b77b29b4d98ce8dce4542d568a02c5f97f0e0f4a SHA-256: c88d286b8ce33a62974f29ea079fcbc57a88cdfff3b78368bb6e4c423e91c932
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with many pointing to unknown domains, and one heuristic specifically identifies it as a link farm. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://lasermedia.cn/userfiles/file/mozisixifojajagusu.pdf In PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/d7227e23d42d083cb12fffdc77168f47.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/ropuwexotalubigomadojog.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/97365072924.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bikalabilatadugabipidid.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lerarabexovabujokanowe.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/56495477730.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/19861733005.pdfIn PDF document text
    • https://red-adlay.com/upload/files/bibitizovajofexuguxeluge.pdfIn PDF document text
    • https://datawire.gr/files/files/99158853107.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142d721675e1---1190247966.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/pasuxubupowuri.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/81839613691.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/62577560879.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/xoxulikugeluvi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412ac5db787---talepi.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/73501673386.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/mudulofejibudelemifewo.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109061555358771.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/52778057952.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/vatawafewupofubak.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/50451076527.pdfIn PDF document text
    • http://bscartridge.com/pic/kumil.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/pudizefetukutotu.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/gezenobisonanubujaf.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/kaxupaxaxovoguzas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=use+usb+mic+on+androidPDF 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_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 18260 bytes
SHA-256: ca086c081f9fc893f23b63524c9b0f8b7cd321a0072fffba6b4dde6f0e4f6bcf
font_02_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 10632 bytes
SHA-256: 66920fa3e55654fc7139b472da72709947210aecace2adb88c820dfffe97b352