Malicious PDF — malware analysis report

Static analysis result for SHA-256 547b8e3b71ca1f3d…

MALICIOUS

PDF

117.7 KB Created: 2021-09-24 00:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76ca2428b48a9c8fa4aefe92dfe212af SHA-1: 342ef2964d25ef0f5c36a672827a15a4c3a4e767 SHA-256: 547b8e3b71ca1f3d2243c89df45f96e390daa84d7355c2facc0d96c026797029
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including ML classification and ClamAV, for being malicious and a phishing lure. The 'SE_SECRET_RECOVERY_LURE' heuristic specifically indicates the document attempts to trick users into revealing recovery secrets or private keys. Numerous external URLs are present, suggesting a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://pixomot.ru/uplcv?utm_term=android+change+restricted+profile+to+normal PDF link annotation
    • https://crownprolaw.cn/userfiles/Proj_Name/files/rowuwopuriwojewuwite.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/lubugenarogotavunigite.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/gumadasabes.pdfIn PDF document text
    • http://coumert.com/images/file/febofuwixafekuxi.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/41706073279.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/vezagomex.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1632134208.pdfIn PDF document text
    • http://zgic.ru/!upload/files/61295354590.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/tagaruxoditigozewikisi.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109201226322434.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/fotebinamek.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210902223307.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/bolepawikakuv.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/96507874520.pdfIn PDF document text
    • http://dytac.hk/userfiles/89902761428.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/79000645851.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/wonubifefeganibigede.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/68537979452.pdfIn PDF document text
    • https://maviet.vn/upload/files/66750246080.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/gazidopigopa.pdfIn PDF document text
    • http://rakuteriyakicanogapark.com/uploads/files/nikatitobifupe.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/16280969179.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/78872178296.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://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_off000165b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B7 19040 bytes
SHA-256: 9b945db699af558dca423bb25db24a7b6290a3627649941b707ec5080642aa4e
font_01_sfnt_off000197ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001afc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFC5 11048 bytes
SHA-256: 6e3c6cfd990a01341cc6d1a29186e60e0c52204d2f93de75abc44d676e45c45e

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