Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b92d021488e61e…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 20:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4baba8197e5159ee09f05f3231b042a4 SHA-1: 2b1a80195f6a290edc0a5a0992cd960b077e941b SHA-256: f1b92d021488e61e37b2dfac3d074d214464dd5c66dd193e0183215cfc07d21f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document is designed to trick the user into downloading a password-protected archive, a common tactic for evading gateway security. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/68eoafak06t66ei16lromfpg6d/rixotajaf.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/g5nr4vh17503bigkvqs7s622r1/gafugisisolatakodisada.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/lotoziloxusejo.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/zukurilisiwibamok.pdfIn PDF document text
    • http://destockbaby.com/ckfinder/userfiles/files/figewalumiserozidawo.pdfIn PDF document text
    • https://uangraja.com/contents/files/76357485306.pdfIn PDF document text
    • https://hirurgija.me/files/gipukomenexuruxem.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/wuzajubapaf.pdfIn PDF document text
    • https://siroyensao.com/upload/files/65494298643.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/1172050990.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/savezinopozosogaw.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630969786.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202191200297892.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/lipubun.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/65883237363.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/fenujusozafovidu.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/ligodulit.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/fixibomasakud.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/23309132684.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/64236402277.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/72987425924.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/21995681677.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/78044192311.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/64393634552.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/kuwuxanexumotivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=is+there+an+app+for+instagram+to+see+who+views+your+profilePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 16788 bytes
SHA-256: 3071abe4e524736593708df322f7a474c52e8333648db4cb718bb008f6c987de
font_02_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 11120 bytes
SHA-256: cc434d4de027084b3e52df9701879f3e0f831c90aef6de20b41537d0a94eec60