Malicious PDF — malware analysis report

Static analysis result for SHA-256 c758f27ec9c52af1…

MALICIOUS

PDF

73.6 KB Created: 2021-03-20 07:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e02879521da7c8956e528ccef22abd64 SHA-1: 7d013d6edf6dfa42c17f81280cecf7518f6c4a21 SHA-256: c758f27ec9c52af1195738cc83decb382bf239989f2473a517e53f80d3447571
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-themed and point to potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=deductive+approach+in+teaching+pdf
    • http://ruxuzosok.mywebcommunity.org/water_supply_and_sanitary_engineering_textbook.pdf
    • http://kamini33.ru/terminator_dark_fate_2019_netflixstumy.pdf
    • https://cdn.sqhk.co/lilokimoz/cieKBWA/best_free_fake_caller_id_app_for_android.pdf
    • http://lasiwefomibew.sportsontheweb.net/2418892149.pdf
    • http://powajaxib.medianewsonline.com/how_to_make_your_boyfriend_a_gentleman.pdf
    • http://normal-id.com/gestational_diabetes_mellitus_rcog_guidelinessh0ba.pdf
    • https://cdn.sqhk.co/bokirebi/iggoihd/bodemasikabutujererifim.pdf
    • https://cdn.sqhk.co/wazofovam/c12igo4/wego_shibuya_city_tokyo.pdf
    • http://fokojudup.22web.org/wunobobalalafotolujedod.pdf
    • https://cdn.sqhk.co/kunimanujage/8TiitPv/synchrony_bank_lowes.pdf
    • http://tuxesimufimiti.mypressonline.com/equilibrio_acido_base_fisiopatologia.pdf
    • http://fajujefa.getenjoyment.net/nopituvizad.pdf
    • https://cdn.sqhk.co/kinemefuwa/Ihgje6J/33729185146.pdf
    • http://fastgetme.online/sub_zero_refrigerator_drawers_with_ice_maker3wdm3.pdf
    • http://allwoman.site/rafael_amaya_tem_filhosgps8e.pdf
    • http://rulabepotinujeb.mypressonline.com/tajaregowadefofinabada.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wirileso.epizy.com/nuvexedulupipozeda.pdf
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_48d5666836404a8a9f4dbcb1e0688813.pdf?index=true
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_159185fa383d4623953445a515eaaaa2.pdf?index=true
    • http://xuvekixofeku.onlinewebshop.net/20518585349.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1da.bin
7c44d5c20d14670d0cec2e27e38e63aed13f45faca18a8268f36ffc9c51ac3c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 5264 bytes
font_01_sfnt_off0000f3d0.bin
809a9a7776cc64fc0740954f3a19bf10b9253ea30efef0d4e17023ba173ff528		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 10308 bytes

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