Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e7c0f3eddae674…

MALICIOUS

PDF

74.5 KB Created: 2021-04-13 04:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a98f346fda23f219539a5e58f50177f SHA-1: b89b97339df192e31e3904bf7363028079216fb6 SHA-256: 24e7c0f3eddae6744e52aa973e51d77734b01cd3771b75b2366a584c93c49089
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 pointing to S3 buckets and other file-sharing services, suggesting a link farm or a distribution mechanism for further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary IOC is the URL 'https://resalured.ru/strik?utm_term=hillsborough+county+school+2020+calendar', which is likely used for phishing or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=hillsborough+county+school+2020+calendar
    • https://cdn-cms.f-static.net/uploads/4418590/normal_604dce111f16d.pdf
    • https://cdn.sqhk.co/zedawuzijis/ijjaicb/lijabikiw.pdf
    • https://cdn.sqhk.co/jojojidatun/hdgcgha/xufokemeleremonuwu.pdf
    • https://cdn.sqhk.co/biwizalibe/cjaAjcu/93623817798.pdf
    • https://cdn.sqhk.co/dosakupu/hhjbCfl/depamefuvalubufonawumika.pdf
    • http://xigegojaliku.iblogger.org/raxasiliwusabore.pdf
    • https://cdn.sqhk.co/jifibipex/Jjaghif/puvogigobuvarejep.pdf
    • https://cdn-cms.f-static.net/uploads/4414358/normal_60215ff13cf11.pdf
    • https://cdn-cms.f-static.net/uploads/4412768/normal_6048d339d4e88.pdf
    • https://static.s123-cdn-static.com/uploads/4482188/normal_6004cb3093f84.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lebejos/8878416175.pdf
    • https://s3.amazonaws.com/tawovojo/87860217478.pdf
    • https://s3.amazonaws.com/polexebuj/rodajamenoxibexinaputu.pdf
    • https://s3.amazonaws.com/defipedibe/auld_lang_syne_violin_sheet_music.pdf
    • https://s3.amazonaws.com/zonebon/70378571009.pdf
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_2691eca36adf478282718bf097192bea.pdf?index=true
    • https://s3.amazonaws.com/pidufozu/myron_mixon_brisket_temp.pdf
    • https://s3.amazonaws.com/zodawanuror/microsoft_outlook_out_of_office_reply_template.pdf
    • https://s3.amazonaws.com/wupiwupiwot/luzaxadufenesebisujime.pdf
    • https://s3.amazonaws.com/lolijexejomak/business_plan_excel_spreadsheet_free.pdf
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_884908d41cbe49128dc7391b20bb84c8.pdf?index=true
    • http://sejixopur.rf.gd/somuda.pdf
    • http://luloxefisamo.rf.gd/allen_minor_test_papers_2019.pdf
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_f81c316ed8784c48a7b1b694bc262dcf.pdf?index=true
    • https://s3.amazonaws.com/penale/22648842813.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_off0000e30b.bin
146ab4810329f374e49852a8409d1e35b81a5cd27c6bb4b553f17007341e8de1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 5680 bytes
font_01_sfnt_off0000f651.bin
fbf5234e9a5c3266427160ffb8f0d13fa76957abb8517c63f68755f9852113b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 10608 bytes

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