Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04fc8f5cdd8bb7a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 13:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52f5717bdb523ec172f82c30326ed2b9 SHA-1: 21a5bf02874bdcc5fef7414497da4b3ce6b1f809 SHA-256: b04fc8f5cdd8bb7a0d5ec6236d29069fe2348b3298f7dcaf3aed567530528cf9
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one directly to an IP address, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of a link farm and direct IP linkage points to an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://webrobogo.hu/kepek/nipuwezujugobad.pdf In PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2796441405.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/86454286950.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/jadofuvapologalibuxexi.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210906080719.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/pudutifakeporafaso.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/xejibisof.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/vilolor.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/22457753555.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/lidusilaj.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/38895401383.pdfIn PDF document text
    • https://magerp.org/upload/files/tatiribixiwipalorul.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/acb159508b5ec1c9a74b9bf48c10e9a7/nuvibuwexefi.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/dipegorunizejig.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/65919011971.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/28642607665.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/23738891695.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/72038328638.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/gufowomebavedataravib.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135427b1bd4a---61024268842.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/gegobawuwadaw.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/48420458362.pdfPDF link annotation
    • https://ldcpc.com/ckfinder/userfiles/files/nonitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=email+notification+android+not+workingPDF 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_off0000d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 17988 bytes
SHA-256: d7c7cb976ebb5f3b122b459348e090a99e8ae869c6efb4870357a443e8bbdce2
font_02_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 10680 bytes
SHA-256: a5ae42d17085910646509f2be294c8ce290c7af0ddfc8895166dd6b7b4a3d91d