Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e75781914efa35…

MALICIOUS

PDF

73.8 KB Created: 2021-09-14 06:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3c5cbfa3b9e9a3267d0313c37f7f6f6 SHA-1: 73e5b6e5359c5ddeb8e9983261340cc900630030 SHA-256: 49e75781914efa354efddc498d7ad7484d59adf5b1a48f9994e27f5c79fd361f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to host malicious content or redirect users to malicious sites. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a fake browser update or extension, a common social-engineering tactic. The embedded JavaScript likely facilitates this by either directly downloading a payload or redirecting the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=farmville+flash+helper+download PDF link annotation
    • http://mutitar.com/user_img/files/74837332105.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/pesebotofagaxukovovupexox.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/46045619886.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///18376940624.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161351a04133da---kodebawofepubofisade.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/34571179125.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/89675947338.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/93151183098.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/noretobepumokaforumekepa.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/pemigokiwinenosu.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/tilamifuxiwudomakiral.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/bopegilatubadazoravolif.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/14787748333.pdfIn PDF document text
    • https://loyd.rs/images/file/82922468276.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/jurazemokiruzowu.pdfIn PDF document text
    • http://grandfiltr.com/files/file/18963814234.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/21508344797.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/5254124963.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/sogutenufaxomol.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/40ca034c33c6cc6570810ab6cfabc60a/82589725955.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/92792862612.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/5959550863.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/80595618873.pdfIn PDF document text
    • 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_off0000be38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE38 16660 bytes
SHA-256: 12ce95f3882f3e8c866a24fd293a11d256eb2b38c62d350b2632338467ce4502
font_01_sfnt_off0000e902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 10796 bytes
SHA-256: 9e7a52b9aa105ac3f3da624314a69eab38c8328d56db6661aa94b4f29d99f10f