Malicious PDF — malware analysis report

Static analysis result for SHA-256 956bd29121d1a2c0…

MALICIOUS

PDF

75.5 KB Created: 2021-03-21 21:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0e9126527d6df837e00e89fbacdb536f SHA-1: 583f4cc223c48f1af5379993b5e3a09bfc3d01d8 SHA-256: 956bd29121d1a2c0ef91dadff85221ddf8d2984d5fd2081b2d71b6318f14633f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that prompts the user to execute a command, likely to download and run a second-stage payload. The embedded URLs and the PDF link farm suggest an attempt to distribute further malicious content or engage in SEO manipulation for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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 https://vilenefex.ru/award?keyword=how+to+convert+pdf+to+word+document+on+mac+free PDF link annotation
    • https://gudeworidive.weebly.com/uploads/1/3/4/7/134767917/1396054.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/54019c6e8175ae1.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/5502630.pdfIn PDF document text
    • http://dixagodal.iblogger.org/meio_ambiente_definicao.pdfIn PDF document text
    • https://dosijikapok.weebly.com/uploads/1/3/2/6/132682778/683316.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gumagabu/turavujukowinebo.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_028d994fd6d24b0aa95960edd0a916e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/bsc_zoology_notes_first_year.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_9523f64d8d77427692ec8711bc65ee4d.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_aab956e9c0d74735a68d85e1db0e032c.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_507e3d1cad784a4b901fd35142905097.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_4da26c4961104659b93249a699a53a40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedure/big_fish_movie_in_tamil_free.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/clockwork_princess_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/aql_full_form_in_logistics.pdfIn PDF document text
    • https://30dce114-5b7d-4ba4-aa44-e083516804ec.filesusr.com/ugd/7de0fd_cb59beb7b9cb4bca95756e45b5f4ae38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woneketelak/53363472858.pdfIn PDF document text
    • http://tixobanawogoki.epizy.com/cartoon_video_song_bestwap.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/tirasexeredisopexulo.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/adrenalina_injetavel_bula.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_cd156a38f2f94a88929e0aa10252d112.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 5204 bytes
SHA-256: c82ff459b467b58e70b50fa0a61c456cf92f7afd47804e276281fceb838d581a
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 10372 bytes
SHA-256: 0232f6073cd9cf0b27aeab30de5ce8cc2aafead6bc939f33bc502ae32097d1fb

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