Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bb11b1b57e4a01…

MALICIOUS

PDF

83.2 KB Created: 2021-03-14 17:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e4a7bd4c94d928dd01cb678c86b1621d SHA-1: d895d429318e72dec0657038f636c196f8d1611e SHA-256: c1bb11b1b57e4a017a4a852490dfe2edf8a126c0716eae0d78e6ae8f0f73e504
226 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document may also instruct users to install remote support tools, a common tactic for social engineering. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/award?keyword=comparative+and+superlative+adjectives+games+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421224/normal_60228e3c7623b.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/ihaNhcZ/stackers_travel_jewellery_box_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/kjiSSlp/24423031989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374185/normal_6045978479641.pdfIn PDF document text
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/golizalofe_rovewalejikog.pdfIn PDF document text
    • https://lavolobaned.weebly.com/uploads/1/3/0/7/130740571/niduvoxifinelo-nuvubemeve-buxudu-depulipovuxog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_601e1c85759bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383567/normal_5fdacb9dae5d5.pdfIn PDF document text
    • https://cdn.sqhk.co/lulaxujik/Xgdhjjj/cobb_theatres_dolphin_19.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/ha6jd8G/27173386611.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/aB4gf63/chaos_road_combat_racing_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/jjwkijh/fanuc_cnc_programming_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/hjRMjjU/wexepebinosetovupuvuzuge.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/5icjhji/21794489491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410962/normal_60207a41c57a5.pdfIn PDF document text
    • https://malizopal.weebly.com/uploads/1/3/5/9/135962708/d7c26c863ab9d5.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/giijilc/nora_fatehi_song_pachtaoge_download.pdfIn PDF document text
    • https://kumojazoj.weebly.com/uploads/1/3/1/3/131381946/816966.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/tidigudetefumof/54960184815.pdfIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_6d0995dc191f444db3ea7482b6ec8c1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujesulad/72544289294.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_3a793d86a8f44e9d8d7b2d77cff04b4d.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_41a1d514a91945c5be9e80de97b134bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fujadabez/splashtop_2_personal.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/titulos_de_credito_reglas_generales_y_su_clasificacion.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/vomuxofal.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_8f958ce5062e4b60b4240063055e64fd.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_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 5516 bytes
SHA-256: 0aeb3bb89dfd962010ab783cf3eff92dab0b56ae3abf3ddeecfa464215ab1d0f
font_01_sfnt_off00011a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A17 10804 bytes
SHA-256: 01965dc63df9295d109d50195983aac615d26f062b117d72abcb923d5bfcf082