Malicious PDF — malware analysis report

Static analysis result for SHA-256 1544dfd08570f5a1…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 02:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c28cbdcd8154d73296fb5593fab499a5 SHA-1: 8e3b5ba6442202366a5bad1317fa862dff0a1fe2 SHA-256: 1544dfd08570f5a11d6b444627b9e028c19fba57fedb52d1638c2c2e3bb5036e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=jailbreak+cash+hack PDF link annotation
    • http://rosabaum.de/web/editor/files/61720426743.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/davifasu.pdfIn PDF document text
    • http://e-menu.hu/editor_up/20033620882.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/24055962616.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613158edd3cf1---ronidasewem.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///29457181905.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109110043515304.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320ad5c79d7---tavodikololoxiwewen.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/86604463958.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210920_AE9ADDB00D4E3516.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/buwagakop.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/poduw.pdfIn PDF document text
    • https://12shio1.com/contents/files/84317461453.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/91527226374.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/fifogarixo.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/71876667971.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/guxuwanepafotidowukuvasiz.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/sikujakakura.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/lalesufadijimavexi.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/15834767352.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-15-07-16-48-45.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/93086862656.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/63630583986.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/zurelakijekal.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_off0000cdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 10228 bytes
SHA-256: 11deea6c9085dc720a3196e0e15bad1e6af1d3c31e85e0e1e72ee230e6eda3e1
font_02_sfnt_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 17864 bytes
SHA-256: 1c2b7efc44ac3c39be472c264b10be51808cc7f42b41166f57a411730d435664

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