Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54dbfd40bb11098…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 04:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b3503a658b0853748a5568387389f08 SHA-1: 2bddb6b7768a0fcc007bea8ff716abae1c259a23 SHA-256: f54dbfd40bb11098782237096dd397b31ceacd0ac8dc27f399aca8414005355c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates the document likely uses social engineering to prompt the user to press Win+R or paste a command, a common tactic for bypassing macro restrictions and executing arbitrary code. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://crewmak.ru/uplcv?utm_term=como+reiniciar+mi+telefono+huawei PDF link annotation
    • http://aryajob.com/user_upload/file/jarebaganexewuxibuwu.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/95663897155.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/levopojarolobasebopotupoj.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/lufinosizox.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/63102467101.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/gunasu.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/surefolekoridedodefudu.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/xikemelotisotej.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/23670723692.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/499c763d7a473e51825a883a9547eed4/91782860015.pdfIn PDF document text
    • http://katela.net/userData/board/file/rogiwavusugegemu.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/4476572953.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/riboxak.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210913160417.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613589bc0444f---fusuxikenaragara.pdfIn PDF document text
    • http://palami.by/images/file/xerekutokifuralares.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/29840744257.pdfIn PDF document text
    • http://fitviewer.biz/files/file/pufasetat.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/tudilewi.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/79905612491.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/wapitak.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/nutivomexunaniluguz.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_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 10648 bytes
SHA-256: 09e6a759989b771c821f9f1712fef0ececb50ee519ed63ecce3fa98ba5958a16
font_02_sfnt_off00011525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11525 19212 bytes
SHA-256: 0bbac8e6061fd76e2ba4b000cf48fb9ff317765ddba7806e4d8f6f234821456d

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