Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f02db117c71458a…

MALICIOUS

PDF

84.5 KB Created: 2021-03-17 09:07:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceb87b92b72d988b556d5c0e48d73922 SHA-1: 9dd8dc9dab6c6ea52c5a0febb40185969e79adbf SHA-256: 9f02db117c71458a070a36f892fb028d3a2ca45a79ef483f2abe818885f6092a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these links, https://botokaw.ru/strik?utm_term=four+past+midnight+stories, is flagged as a potential phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a link farm designed to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://botokaw.ru/strik?utm_term=four+past+midnight+stories
    • http://xikapajami.mypressonline.com/monroe_shocks_catalogue_south_africa.pdf
    • https://befufagu.weebly.com/uploads/1/3/1/3/131384284/nelujuzidimemub_vadidotegoxa_vogumije.pdf
    • http://pivolirarorip.mypressonline.com/l_amant_en_francais.pdf
    • http://tilikef.mygamesonline.org/hernia_umbilical_estrangulada.pdf
    • https://burigazipe.weebly.com/uploads/1/3/4/7/134764527/ludulad.pdf
    • http://fepaporipevari.mypressonline.com/72189790964.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://daximogosamov.myartsonline.com/ultimate_antihero_light_novel.pdf
    • http://salajire.onlinewebshop.net/xefapiw.pdf
    • http://totefopige.atwebpages.com/55563801606.pdf
    • https://s3.amazonaws.com/zurovajij/lic_admit_card_link.pdf
    • https://s3.amazonaws.com/wapabefizosumi/39117532940.pdf
    • https://s3.amazonaws.com/farefasejikap/xogokij.pdf
    • https://s3.amazonaws.com/wanasuvedigo/caroma_forma_rimless_toilet_review.pdf
    • https://s3.amazonaws.com/zesixefe/letter_asking_for_financial_aid_template.pdf
    • https://s3.amazonaws.com/wisuw/refepo.pdf
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_9fe56f7432a64d3bb6e6b67dc723099c.pdf?index=true
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_a878bf18eae642c38459354b4aa56eed.pdf?index=true
    • https://s3.amazonaws.com/jobavo/diwavezibepedeg.pdf
    • https://s3.amazonaws.com/jeduzizonox/panimupekaronivepagig.pdf
    • http://nufulavidibime.myartsonline.com/descargar_manual_prctico_del_operador_de_calderas_industriales.pdf
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_0e95dd0e93c34f988e9cf6fdd7ab659f.pdf?index=true
    • https://s3.amazonaws.com/wogikokuzotaxa/antibiotic_safe_in_pregnancy.pdf
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_99c1a9ac60fc4dd8a9d6191476adbaef.pdf?index=true
    • 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_off00010e49.bin
8df968963e08be55fcd9d9293021070e6c00968a2a51311195b30a93216f3697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 5296 bytes
font_01_sfnt_off00012020.bin
b678d27c3acdd14e17b6b4cb9fd9ee2845a65e55b93ea72f4310210d6a747776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 10880 bytes

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