Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89138a3706e1954…

MALICIOUS

PDF

83.6 KB Created: 2021-03-15 09:27:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 762c5daebd13e0d18100adcc84c52c67 SHA-1: b96707a43921d3611cee8eadc41178ff7b853f8f SHA-256: b89138a3706e1954712803629dbf9b56c5e92116770675e3b5d52745f24c6d73
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary malicious URL identified is https://soxebez.ru/wix, which likely serves as a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/wix?keyword=abiotic+factors+of+a+mangrove+swamp
    • https://cdn-cms.f-static.net/uploads/4405641/normal_6011de6e6bcc3.pdf
    • http://baliferifopiz.mypressonline.com/making_sense_of_astrology.pdf
    • http://biomaniks.website/43505627011lac3p.pdf
    • http://rawenspant.online/15917969060yqggb.pdf
    • https://cdn-cms.f-static.net/uploads/4472775/normal_600ab7353612a.pdf
    • https://cdn-cms.f-static.net/uploads/4383295/normal_603fc4ac89ec8.pdf
    • http://wewofif.scienceontheweb.net/96422433724.pdf
    • http://national-verifyteam.com/driver_booster_free_for_windows_10jw5w0.pdf
    • https://cdn-cms.f-static.net/uploads/4456399/normal_600d9a69579b3.pdf
    • http://rugegav.mywebcommunity.org/fedezerifiwudu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nibubatovavav.atwebpages.com/palowiremavinudejor.pdf
    • https://s3.amazonaws.com/sumesawoxajew/cover_letter_report_sample.pdf
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_ea822fb0dd9541a6a522d84d7440df95.pdf?index=true
    • https://s3.amazonaws.com/biwuwukesazef/finebujoxolodir.pdf
    • https://s3.amazonaws.com/jijari/54503829809.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/construction_company_profile_format_free.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/69001059730.pdf
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_8d816e923117416c9bd4f0cc574f0483.pdf?index=true
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_aefb6715f9b242f7b017ff9bc26e0283.pdf?index=true
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_5117943d42d542e391237029bc93c369.pdf?index=true
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_2e08ca7e120e450596678f6df9def4ea.pdf?index=true
    • https://s3.amazonaws.com/kobivimelelo/reservation_form_function.pdf
    • https://s3.amazonaws.com/bibejovixapis/sumir.pdf
    • https://s3.amazonaws.com/niporofez/amplifier_lyrics_song.pdf
    • http://fegoluvarelewum.myartsonline.com/descargar_gratis_el_libro_egipcio_de_los_muertos.pdf
    • https://s3.amazonaws.com/lanaladu/prezi_able_templates.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010812.bin
43c4b442cbd344729f3dc1347127dcf231e6acd3ef64e9dbacbf5a2ed90f01a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 5584 bytes
font_01_sfnt_off00011b17.bin
1906e82fd6816411ae32fa2c2ea51cfc364d0c7453a19521f0eea72a6e11c4a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 10536 bytes

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