Malicious PDF — malware analysis report

Static analysis result for SHA-256 842cc51b423d1460…

MALICIOUS

PDF

70.5 KB Created: 2021-03-25 16:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 64d49c5a383ec8b950256f90ca6e71d4 SHA-1: 51ebd8f4f2cb934ea68dc3d7368ed59d731adfc7 SHA-256: 842cc51b423d14608d1fea7c9e9fbf86c6ebbaf1b694b4f57193b556c17cef5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or malware delivery. No scripts were extracted, but the extensive use of external links is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/award?keyword=articles+a+and+an+worksheets+for+grade+2+pdf PDF link annotation
    • http://vakoxojokovuvi.iblogger.org/selenium_webdriver_using_node_js.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484821/normal_5ffcf13d83208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418369/normal_60521f0329de1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463526/normal_6035a6eb6189f.pdfIn PDF document text
    • https://cdn.sqhk.co/voguzasijur/giThegh/99431976646.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/ee869ee60128c.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/45228580762.pdfIn PDF document text
    • https://cdn.sqhk.co/zapevexuvot/1gjjhYC/77016848719.pdfIn PDF document text
    • https://dojiladise.weebly.com/uploads/1/3/1/3/131379401/a9dc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500679/normal_5fc8884f3d4bc.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/6118508079.pdfIn PDF document text
    • http://kewatupu.scienceontheweb.net/66162895620.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/aN2ggie/nufawepufakifowir.pdfIn PDF document text
    • https://nejuxudukekiti.weebly.com/uploads/1/3/0/8/130874136/palefipunulu_dapade_togil_zutikukojul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_622e2a57fbb5493c9c2e3d4d9cacedb7.pdf?index=trueIn PDF document text
    • http://nuvebabe.atwebpages.com/bill_of_rights_south_africa.pdfIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_8546c5507f3144b5aec8e70b3f56109e.pdf?index=trueIn PDF document text
    • http://kevisokifo.rf.gd/inteligencia_emocional_que_abarca.pdfIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_6f1f237c653941969dc1ddfbe372126c.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_bf5c319c50af4d9195b69e99a0661d2b.pdf?index=trueIn PDF document text
    • http://rijemow.onlinewebshop.net/diablo_2_runes_worth_keeping.pdfIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_ade1b735794048c3b393a00e61f76be0.pdf?index=trueIn PDF document text
    • http://tasopawak.rf.gd/oleanna_play_monologue.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_off0000d437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD437 5692 bytes
SHA-256: a8f50ba593c81ea3cfa9145820304d6007513fdcc21ef23269dd8b3cd7ee3d42
font_01_sfnt_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 10700 bytes
SHA-256: 84e0e927550003a626403429a0828b20a9b91de1bfe01e9534cba52a77588183