Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ea6b6603029b73…

MALICIOUS

PDF

74.9 KB Created: 2021-02-26 05:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f28b5c753f51d1d00177142a9621c6aa SHA-1: d8f27026de9ff187179f361c55000efa0c494209 SHA-256: e0ea6b6603029b73475bdb34f5b4e0e771f1205808178ccef36af14e72f26646
126 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to unknown or suspicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a disguise for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=fallout+4+prima+official+game+guide+pdf PDF link annotation
    • http://cethq.xyz/supply_chain_management_schools_in_houston_txebgo6.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/gggfjjC/jajokuvirufinepidu.pdfIn PDF document text
    • http://bred-enligne.com/5096261443rqqu0.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirurafixi/G5cdThg/how_to_pass_the_colorado_permit_test.pdfIn PDF document text
    • http://air-calm2.club/211760171265t718.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxifup/dmlYdrY/royal_princess_island_run_endless_runner_game.pdfIn PDF document text
    • http://lovemecompletely.com/what_is_the_theme_of_the_house_on_mango_streetkzbi4.pdfIn PDF document text
    • https://cdn.sqhk.co/gekobegij/ejfeVje/how_to_get_teacher_assistant_certification_in_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/hdjjgi3/tumblr_login_problem.pdfIn PDF document text
    • http://povonuzakor.22web.org/5261168989.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gapivegek/cisco_catalyst_2960-_c_series_pd_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/23676477519.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/mekonuxipumawiwilawenimom.pdfIn PDF document text
    • http://sukufitax.epizy.com/62078212079.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 5340 bytes
SHA-256: c4215f2748260d7fbc76e8a3bfb5aa499ba6daaddaca3540427be57e26bdaafa
font_01_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 10936 bytes
SHA-256: b634f5aee05e6e2c61397c3c859a265829bfef3f33e0561e8cf4d873ad971408

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