Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96d2cb9d12c0c8e…

MALICIOUS

PDF

82.9 KB Created: 2021-04-05 14:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 724f5237f70376fcdcee458a40ff3080 SHA-1: 80aa2074d37f2033cb7fbeebf3a5a911b80ed5d4 SHA-256: a96d2cb9d12c0c8e19ecf689dabbeb0fac22edad8325b9d5a549f7005faece78
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, suggests a lure related to labor studies, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://xajibur.ru/strik?utm_term=introduccion+al+estudio+del+trabajo+oit+limusa PDF link annotation
    • http://hot-money.fun/how_to_test_a_dogs_temperamentyrh6i.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/62008107178.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/cen-tech_p35017_multimeter_manual.pdfIn PDF document text
    • http://bigwin-1xbet.fun/nijavewofarcssz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5fd8a1fce5bd5.pdfIn PDF document text
    • http://migriruy.ru/tire_size_guideck9tx.pdfIn PDF document text
    • http://crysety.xyz/44824385497s7y51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489994/normal_5ffa1721be154.pdfIn PDF document text
    • http://aarbuz.space/biochemistry_and_biophysics_reports_elsevier9iy12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450046/normal_605231a7b7b45.pdfIn PDF document text
    • http://agent-ritual495.online/72238197849we938.pdfIn PDF document text
    • http://kolekewoni.mywebcommunity.org/american_history_test_2_quizlet.pdfIn PDF document text
    • http://bizifemodefi.mygamesonline.org/types_of_allen_bolts.pdfIn PDF document text
    • http://keto-menu.online/succeed_in_cambridge_english_proficiency_8_practice_testswh4gp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_996fa1e5a0f1451588e47cc6656a6c62.pdf?index=trueIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_c849040b43be45ca9a021e68aaf65e63.pdf?index=trueIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_857b03bf19ab45c58d9c3f0768b25b05.pdf?index=trueIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/nopomaze.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_754bc6619a82465eaf08886323920ceb.pdf?index=trueIn PDF document text
    • http://vorisenunajix.myartsonline.com/michael_vey_book_4.pdfIn PDF document text
    • http://sopexalibip.onlinewebshop.net/81016965180.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
    • 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_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 5236 bytes
SHA-256: 1fb88b9abebf394af42f4767184dc927a9e56a76c3e6794ca8e644139aeb75a3
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 11804 bytes
SHA-256: f9e1851ffaadd402c99d95ec911a8b66f17932b2738c67c185f558ef26264b15
font_02_sfnt_off000126a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A6 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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