Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c53316ab46c9de5…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 15:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 465c15a2d6ff2181c8eb34eee61c80c9 SHA-1: b72987f996aad60254997919be4458ee1462f87a SHA-256: 5c53316ab46c9de57d7322bae010ff135bc8dc3f4a9137f88c34592f4f4e2f44
106 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and exhibits social engineering tactics consistent with ClickFix attacks. The document likely instructs the user to press Win+R or paste a command into a terminal, aiming to bypass macro restrictions and execute a malicious payload. Numerous external URLs were extracted, suggesting a potential download or redirection mechanism for further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=night+mode+for+chrome+pc PDF link annotation
    • http://lungshingcentre.com/userfiles/91588772770.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161340e29ef077---furoxuxoman.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/jisojomiwamabab.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210910_6333ABBF917EDFDF.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/nojokuzejaferovol.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/60526273542.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/rarelakodivozememosob.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wewoputoralovixabafu.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/88423934024.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/setigabu.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/92084681619.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/81872720623.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/betaxaxafutopit.pdfIn PDF document text
    • http://elitk.ru/_files/83373176943.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/25368406881.pdfIn PDF document text
    • http://chineseclothingonline.net/File/30500321141.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/bejavubujifefewifasajigud.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210906_EEDB87E55C564ED9.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/51036375197.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161365210656fe---velibefowuwubovifane.pdfIn PDF document text
    • http://orem.mn/uploads/files/49703523785.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/70677668316.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613be5ed1af46---lumulobebejezum.pdfIn PDF document text
    • https://labelmarket.pl/data/file/23920658365.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_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 20716 bytes
SHA-256: 68e282695153ecfb8598d1358adbd6f7ec31ad64f4fd2b56b8fb5b20db80352b
font_01_sfnt_off00011619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E30 10564 bytes
SHA-256: 6e47bede07209feb466b1c1f04feafd5fceab98a5ed320f8356a61dd81bcb995