Malicious PDF — malware analysis report

Static analysis result for SHA-256 414d153f821251dc…

MALICIOUS

PDF

76.1 KB Created: 2021-04-15 07:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ea2adf847737d14511adaa1a6ac99126 SHA-1: 0cfaec9f94dd9ac5e6821ab2838d2e3915a3ed87 SHA-256: 414d153f821251dcfbee7ddcb2ef6962f031405b3bbc78ade0c2ebe40aa94f24
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://bologen.ru/strik?utm_term=a+short+course+in+digital+photography+by+barbara+london, is flagged as unknown reputation, indicating a potential malicious destination. The PDF structure and the presence of numerous external links align with techniques used to distribute malicious content or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://bologen.ru/strik?utm_term=a+short+course+in+digital+photography+by+barbara+london PDF link annotation
    • http://ragomuzaku.iblogger.org/reglamentos_industriales_de_los_generadores_de_vapor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_a7cde45403f647eea945d36d46abf36a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97926b7a-f42d-4241-87cf-aad4d645a47b/how_much_is_dunkin_donuts_munchkins_philippines.pdfIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_3fedbc17349443878ef34d0c6f60a0c1.pdf?index=trueIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_e3f435d348a74c0dbfa546777141000a.pdf?index=trueIn PDF document text
    • http://vupumexaridajiz.epizy.com/lunotakefawuxiveti.pdfIn PDF document text
    • http://gokobuvutojo.epizy.com/manoditijukopomonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1327cbd6-7aed-487c-bcc8-14507838a5e8/kusubabiboz.pdfIn PDF document text
    • http://marivugedada.epizy.com/11334494767.pdfIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_90ed077b8f5d4f25a2c26a9263eb462c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6667a87-fd94-434f-ac97-e1f27efcda2d/7646969249.pdfIn PDF document text
    • https://8de17e8c-b43d-4143-985d-773a0aa332b1.filesusr.com/ugd/01f6ad_2baab9f590724218af026b21b123f81a.pdf?index=trueIn PDF document text
    • http://xumomevafuvozup.rf.gd/7221140944.pdfIn PDF document text
    • http://jatujij.rf.gd/91870101006.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_9a72c0c8d7834844b65592d37ec75964.pdf?index=trueIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_cc7f4179a3ce4134bbce2eb034a70122.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a767c5-4e87-4ceb-99c3-170134737a93/wokenonavo.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_9ed553c7c11e47108aedfc64c4945479.pdf?index=trueIn PDF document text
    • http://radizala.epizy.com/projet_d_alphabtisation.pdfIn PDF document text
    • https://c6b89c2f-dc7d-490d-a648-077c51828da9.filesusr.com/ugd/29ab01_e332c06b5338465795e0f7aa2f1a4a91.pdf?index=trueIn 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_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 5564 bytes
SHA-256: 2936d9afdf2274e7eebdcdba6a8b7294ee9812634f45f535dfbb657970b0a40d
font_01_sfnt_off0000e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 10908 bytes
SHA-256: 3d2cb027c3df8eb2ddb3a82827b3bfdae03be02ac56402df5050d2fd80d97079
font_02_sfnt_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 16084 bytes
SHA-256: 29b8095464fa9501f2379a4c43ca3ba1b1df604f87f2abcbe11fa9bdafb8ec10

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