Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6aa8f50c296055c…

MALICIOUS

PDF

80.0 KB Created: 2021-03-25 07:11:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ffbb38281ad7409f7566ef0a30da2cde SHA-1: 7eddc70380637bec51de462f00a1249aae074c22 SHA-256: f6aa8f50c296055c4e5447329b622609dc97f1d99f9f348e5fb57764ccba0fb0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://resalured.ru/strik?utm_term=1+to+1000+numbers+in+english+words PDF link annotation
    • https://kuwobudub.weebly.com/uploads/1/3/4/5/134587752/mujefilapur.pdfIn PDF document text
    • https://vaxetilunakado.weebly.com/uploads/1/3/4/0/134012354/4a5c42a17b5.pdfIn PDF document text
    • http://vizenam.medianewsonline.com/kizalikadixedigi.pdfIn PDF document text
    • https://luroxonigin.weebly.com/uploads/1/3/1/4/131406321/jaturulolevol_jilekejuvaxose.pdfIn PDF document text
    • https://temavemata.weebly.com/uploads/1/3/4/6/134611183/konalukoda.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/rodipevolariwinipi.pdfIn PDF document text
    • https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/jebabexebaguto_vixeluwebiz.pdfIn PDF document text
    • http://nakozek.mypressonline.com/58575680888.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/95387433342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_3a793d86a8f44e9d8d7b2d77cff04b4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujapu/dezikaku.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/87306834820.pdfIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_11eb9dd38d0044d8966198fa879bfba6.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_7f46e3bc7eeb4699a2cde2983720b5f3.pdf?index=trueIn PDF document text
    • http://fazovalekotevo.onlinewebshop.net/56729081831.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_36935f9f3d4045c0b9aacb9575f6000c.pdf?index=trueIn PDF document text
    • http://jidabaseruf.epizy.com/ramomudapaxakozemotom.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/midnight_sun_movie_trailer_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/sql_server_table_fragmentation_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/cigarra_e_a_formiga_fabula.pdfIn PDF document text
    • https://1d78cdce-0032-4a75-b9f1-030f6b068c24.filesusr.com/ugd/32f660_97a4eb7db8564878b4bb6bcf298e728a.pdf?index=trueIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_a45c8369334148449b701c47e125e5f9.pdf?index=trueIn PDF document text
    • http://xubedoper.epizy.com/blog_post_format.pdfIn PDF document text
    • https://c75ed97e-f406-4d79-b864-c99612e64be8.filesusr.com/ugd/a66d15_482aa6dc3c56478580019456d19358f1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 5360 bytes
SHA-256: 5d4c97061a73e50c2cc8cb658461595f5b4ba04edeb875212636efc72588248e
font_01_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 10928 bytes
SHA-256: 802126d1a6ce404bef21a64b7c35038958c786899c3f7ad7caf1e650ef84fea6

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