Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3873feaa572fa28…

MALICIOUS

PDF

85.5 KB Created: 2021-04-22 22:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 949ecfc6ee48aa959f644269998ac979 SHA-1: dcb74fa23b4036b4d812e18dadf60897c33a3cc9 SHA-256: e3873feaa572fa28f47a0da33fe953b7591a255327971c03a03954abecb5333a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, pointing to numerous URLs. The embedded URLs and the document's structure strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

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://ponafet.ru/strik?utm_term=chick-fil-a+nuggets+nutrition+30+count PDF link annotation
    • http://rubisteq.online/12969464249jedxc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393204/normal_600109b31f107.pdfIn PDF document text
    • https://cdn.sqhk.co/rogudokives/lifEQgf/25794344487.pdfIn PDF document text
    • http://lyudi23.ru/the_divine_conspiracy_epica93dnd.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/jjfhegh/pawotolifebolo.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/scythe_miniatures_painting_guidetjx8p.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/glossary_of_medical_terms.pdfIn PDF document text
    • http://alifan.store/universal_waite_tarot_bookzi4dr.pdfIn PDF document text
    • http://xikumidevulofo.iblogger.org/centre_formation_chaud_froid_nabeul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_6029f069b201a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474734/normal_6049ba3ae1167.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/lefapugiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://molujafit.atwebpages.com/what_term_describes_the_process_when_two_or_more_atoms_bond_together.pdfIn PDF document text
    • http://dogiwexor.myartsonline.com/belajar_tajwid_lengkap_beserta_contohnya.pdfIn PDF document text
    • http://wakunama.rf.gd/ecommerce_templates_free_responsive.pdfIn PDF document text
    • http://tivexedasabuxi.myartsonline.com/advanced_technology_in_automobile_engineering.pdfIn PDF document text
    • http://ditajizuru.rf.gd/32197052812.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 5448 bytes
SHA-256: da4a67cd56530c6d30d19952f4d2a1af5f9d60f203d96ad3d72b24c534603580
font_01_sfnt_off00010158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 10528 bytes
SHA-256: 84ffdc4379ff7eab1f82779fc2b496ac7948e985668a96eb72f1d0d4f0d80e0f
font_02_sfnt_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
font_03_sfnt_off00013a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A33 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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