Malicious PDF — malware analysis report

Static analysis result for SHA-256 6523c1a6753c7388…

MALICIOUS

PDF

93.2 KB Created: 2021-09-22 14:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52c812aa5795494a8202e54c04a5502e SHA-1: 6824ca05c148cac1ffd2b3439350e2260094d74a SHA-256: 6523c1a6753c7388f8939df43596d013816a8ab930bbf0002978a8b30b460146
214 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link to an algorithmically generated URL and a 'ClickFix' social engineering attack that prompts the user to execute commands. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to lure the user into downloading a secondary malicious payload, likely a PDF, from one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ormansagszive.hu/upload/file/32846789317.pdf In PDF document text
    • https://bcm.es/files/galeria/files/zopegasibotadafuk.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/85451835393.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/24282625647.pdfIn PDF document text
    • http://secoinblock.com/upload/files/vigigofojem.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/37026563593.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/geralive.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/39331486200.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/59882843386.pdfIn PDF document text
    • http://surausa.com/uploads/files/walezuxujovuna.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/8109707771.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/faninutuxexinokan.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/wuvasejinawasok.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/pajugepesapa.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/dasewojud.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/zuzuk.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/51036313412.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/tupuvepepuwavu.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/wekulikajisif.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/newapu.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/53041620483.pdfIn PDF document text
    • https://digireg.cn/upload/27598886735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=transpeed+6k+firmware+updatePDF 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_off0001038a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038A 19068 bytes
SHA-256: 51bb4d67ac09831257cb9dd739219647525e666b14fdbda40da7a7ec3d57c2d2
font_01_sfnt_off000135c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDC 10904 bytes
SHA-256: 43ab4cd306c2018d48732282de335d25e8fb7ce0d12e6e02fa60f823443e5a27

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