Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e102b8e2c8303b9…

MALICIOUS

PDF

80.8 KB Created: 2021-05-05 13:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 559f8c06eb4ddc9fd1bb9ca3dbe0dcf1 SHA-1: 9714a2e8823f8b3fe243b9690ccabb8f1b9df1fb SHA-256: 5e102b8e2c8303b91b840746aedbfeb99871ea99aeace4dcbae53fd7d2b295fd
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 pointing to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/strik?utm_term=que+significa+taller+de+lectura+y+redaccion
    • http://vuzopozakobepe.22web.org/25179363300.pdf
    • http://bigomipami.22web.org/83777693575.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/248e4829-105e-4662-b3d6-6878fa6367ca/fabiwigidemufumoda.pdf
    • https://uploads.strikinglycdn.com/files/d140186e-824c-43c6-b016-bba4f58a1406/38920672403.pdf
    • http://pifetipopazemex.rf.gd/88676083569.pdf
    • http://sujosivetobifir.epizy.com/61207239375.pdf
    • http://podixevobelataw.rf.gd/67920634128.pdf
    • https://uploads.strikinglycdn.com/files/5f8693a3-b2a2-43fd-a1eb-7bb91412feee/can_usps_return_package_to_sender.pdf
    • https://uploads.strikinglycdn.com/files/651b4aa7-e676-4a9a-99b0-11010ab73f6a/69600254423.pdf
    • http://lakugarim.rf.gd/isanti_county_news_police_reports.pdf
    • https://uploads.strikinglycdn.com/files/b0ae27ca-49cc-42d2-9184-c4080808cef3/23116358354.pdf
    • http://rujujarorimepa.rf.gd/35596890677.pdf
    • http://suwinateno.epizy.com/essential_biochemistry_test_bank.pdf
    • https://229c0a76-8cd2-4a6d-ad64-a548a1436bbb.filesusr.com/ugd/f9ed01_d010141875344797b525b378be0efb60.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e9812f47-a87e-4c1b-be68-b092ac5a42e1/fidusexumukefezet.pdf
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_5f6882a4f2cc4aee977cf600ac57b0a1.pdf?index=true
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_f8c3f267cb3a41c9a386ca2fa4718f01.pdf?index=true
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_39abfab39c6b4b32863dfa2dddab1b0d.pdf?index=true
    • http://mugavividuroka.rf.gd/what_are_the_techniques_used_in_identifying_academic_writing_from_others.pdf
    • https://uploads.strikinglycdn.com/files/522a0696-03ee-4412-ae17-baaef2d02e36/machine_learning_and_data_analytics_using_python.pdf
    • https://uploads.strikinglycdn.com/files/e2e68502-ba9e-4238-bc11-7c47c65ffa97/dexipuvul.pdf
    • https://uploads.strikinglycdn.com/files/3f7922d5-32ff-4e1e-aa28-3e8912639ad9/bakojuzinizovigu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d1.bin
9ee0a1992de8685a380f9406abd18184bc2ea37ebcd7879c63c2723f1bac6991		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 5352 bytes
font_01_sfnt_off0000f822.bin
92af36e1fe6889cb1450aa850c3d648d53d6adbed2adba2914c4225c2839f420		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 11736 bytes
font_02_sfnt_off00011e58.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 16204 bytes

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