Malicious PDF — malware analysis report

Static analysis result for SHA-256 7213717acb3cf0ca…

MALICIOUS

PDF

71.6 KB Created: 2021-04-02 11:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67fb6b1c3dd2a0e7add7d7babe0e31fe SHA-1: 7918cee9ed3c4adfdf1afdaf92663e604d376aac SHA-256: 7213717acb3cf0cafb2a85c6ecb73276f4a4418a0ccba2bbd2c7e1faeca8c0b2
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, and one specific URL related to a worksheet. ClamAV and ML classifiers strongly indicate maliciousness, specifically phishing. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=calculating+protons+neutrons+and+electrons+of+isotopes+worksheet
    • https://static.s123-cdn-static.com/uploads/4402533/normal_5fee712c5cd78.pdf
    • https://static.s123-cdn-static.com/uploads/4412778/normal_6003aeed56ecb.pdf
    • https://povuwifapijolak.weebly.com/uploads/1/3/4/2/134265363/a3383e13.pdf
    • http://juzibekemuvur.iblogger.org/38843028289.pdf
    • https://zolezuborejizo.weebly.com/uploads/1/3/4/4/134444688/4969299.pdf
    • https://zomogazafef.weebly.com/uploads/1/3/5/3/135348967/tabagu-sezugo-kuromaripe-sozav.pdf
    • http://nuverlites.online/sports_illustrated_swimsuit_edition_2020_plus_size_model1rj8h.pdf
    • https://cdn-cms.f-static.net/uploads/4415937/normal_604d79b84fba6.pdf
    • https://sutulozutujak.weebly.com/uploads/1/3/4/8/134884412/5714984.pdf
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/3750239.pdf
    • https://cdn-cms.f-static.net/uploads/4504568/normal_603389d492340.pdf
    • https://fejilezujew.weebly.com/uploads/1/3/4/3/134340931/funuguxuv-pojasigu-supibujumezu-rutas.pdf
    • http://nicechange.space/ford_ranger_4.0_v6_towing_capacityclmm5.pdf
    • http://sevastopol.sale/96285303874vh6l4.pdf
    • https://static.s123-cdn-static.com/uploads/4453336/normal_5ffa04c53089d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lomuper/riwibudegobukewupemifavo.pdf
    • https://s3.amazonaws.com/sitok/vatevubomazesafefipi.pdf
    • https://s3.amazonaws.com/gixirojozogufux/open_office_writer_freeze.pdf
    • https://s3.amazonaws.com/nakuzafol/tukupiwigapunegusabal.pdf
    • https://s3.amazonaws.com/gusule/87249209458.pdf
    • http://xotekibibira.rf.gd/pomadurig.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_off0000dabe.bin
024076d16f1f41ab86f82e20633f87a6e97a3a23c1caf07148446f1175d76161		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 5476 bytes
font_01_sfnt_off0000ed68.bin
4c15e144d99ceba53568a110336bbbf93106601b4e2d019536b43b4379a780bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 10232 bytes

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