Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c77aef59d1d2f1e…

MALICIOUS

PDF

84.3 KB Created: 2021-05-15 14:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e24e114cd58b37bee476472390c3a105 SHA-1: dfcf6f6e4f1de2e9587dc07440256f03f9f79ec7 SHA-256: 3c77aef59d1d2f1e7721cdf0da22ecf21baa33f73a710ef862b7e2848e6e6b6b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://baarspo.ru/strik?utm_term=difference+between+evolutionary+and+revolutionary+social+change PDF link annotation
    • http://sagunutu.medianewsonline.com/4555901935.pdfIn PDF document text
    • https://cdn.sqhk.co/mejofiwog/eYiihcW/change_lock_screen_pictures_windows_10.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/gavixujejoxel.pdfIn PDF document text
    • https://jerewetazawupej.weebly.com/uploads/1/3/4/3/134384555/miloxusuz-betirurusadib-sukuxojetowex-gedasijitof.pdfIn PDF document text
    • https://pimujupaz.weebly.com/uploads/1/3/4/4/134440235/3013532.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/catlogo_mary_kay_diciembre_2020.pdfIn PDF document text
    • https://rigaxufoze.weebly.com/uploads/1/3/4/3/134386371/4a17449f885d14.pdfIn PDF document text
    • https://sabumamopadav.weebly.com/uploads/1/3/5/9/135957329/5599445.pdfIn PDF document text
    • https://nanagupuwaxa.weebly.com/uploads/1/3/5/3/135322083/5243002.pdfIn PDF document text
    • https://rozinezo.weebly.com/uploads/1/3/1/6/131636990/55aae.pdfIn PDF document text
    • https://pivuwexigika.weebly.com/uploads/1/3/4/3/134320842/pexumofa_fogalinuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/zakolemafemo/icciajd/arcgis_pro_2._3_free.pdfIn PDF document text
    • http://bexukavinawexov.mygamesonline.org/important_days_in_year.pdfIn PDF document text
    • https://repepojopojak.weebly.com/uploads/1/3/5/9/135970902/lijet.pdfIn PDF document text
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/vopaso_rojukakode_velitupenerixos_nuxemiwetoba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/company_ratio_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/algebra_1_textbook_mcdougal_littell.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/54982044182.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/everything_is_figureoutable_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/gewipifoz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 5676 bytes
SHA-256: b7e420f8e0add46055f313b539b4a704a5e42b8cae6f76fe5e7e0f4feb9df61c
font_01_sfnt_off00011296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11296 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00011b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 11384 bytes
SHA-256: 5884040635abd806b8f561a6ea26190c2914700a2c170642bb4df08bf875e13b

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