Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9b343690e52ea7…

MALICIOUS

PDF

103.3 KB Created: 2021-04-21 22:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb81304cd649b1487a75aa48daa57653 SHA-1: 2be02229e12fd01703b61021803fba6bd98d71d4 SHA-256: 2c9b343690e52ea7440d9bc0b4304720d81b23f4d8689f491060a8fd7197ab1e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, including one pointing to `seumenha.ru`, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to Minecraft, a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://seumenha.ru/strik?utm_term=how+to+make+a+water+machine+in+minecraft
    • http://creditscorecard.info/73024925364wmbc3.pdf
    • http://perevozka.ru/14941111287wqv6n.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://mamuzomilap.iblogger.org/89705213934.pdf
    • http://pidagenavuziw.mywebcommunity.org/gujedalobezuxos.pdf
    • http://kokofiru.22web.org/bestway_cement_annual_report_2016.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_2014319e1f2c467abaf6d9c409d649b3.pdf?index=true
    • http://zesafemumibow.myartsonline.com/c_difficile_guidelines_2020.pdf
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_3d2e45998b8b4bf792132f8472e41a4d.pdf?index=true
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_d4261711ab00418cbfcb2c38f21128dd.pdf?index=true
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_2d8042ba890a402d82ca67ea392d3b6c.pdf?index=true
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_c5dcecd7329b416fbb3091071703143b.pdf?index=true
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_fba3c5855a8941298bcd9982b2c21a9d.pdf?index=true
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_dae074b02e5b4a42a9728f629411d998.pdf?index=true
    • https://20e8ec16-a7ca-487e-906f-4b2d5c2744e2.filesusr.com/ugd/ab81b8_545ca50b532b442f81e836d2ed78c54c.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145e3.bin
8f55773e2473e1f280b7c80869367bed86620dae311c7395fdfd5447dbf2a992		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145E3 4816 bytes
font_01_sfnt_off0001561d.bin
650c218bde4af07a2a1f91ec9b8f120d9aab9f6871d65f2b9426aed601dc1b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1561D 12420 bytes
font_02_sfnt_off00018038.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18038 4324 bytes

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