Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cb504007b04445…

MALICIOUS

PDF

94.3 KB Created: 2021-09-17 11:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6bf8bdb4123cf5761f723a08b7e56a08 SHA-1: 6b6512bda57ff5a3897ce20c094849f258c809af SHA-256: 52cb504007b044457b9533424d247f9a29440cc0522f6035c1be91303ef54797
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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 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://ddshower.com/ckfinder/userfiles/files/kuzitiru.pdf In PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/juguzozapunador.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/25966695547.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/worawosusotesudoja.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/74358197688.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/20775667684.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/t2rco6eg5ro4kps3qgd1n5cupg/waxemotaxativeko.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc53f3720---xuvofunimanobekub.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/nuxezewikumejadijavir.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/kaviragizavubekixulekagor.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/razaxinivefodemazetuju.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/sipofe.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/gijujejobigud.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109070909451488.pdfIn PDF document text
    • https://samudra99.com/contents/files/zobudojafenovugonosilovom.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/tofonoduxukidamarefegibot.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/bodavijitowuwalajapavu.pdfIn PDF document text
    • http://foodchemsino.com/d/files/84240786031.pdfIn PDF document text
    • http://erdbau-rauch.at/25305617594.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/91102370338.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/zuredoweluvowitogapibo.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/pugarolerumulevesosa.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/fibuxoxefux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=zombieland+double+tap+charactersPDF 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_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 10980 bytes
SHA-256: a611b90c602c7c8b52545d3b0a0f62a6c0868df7877cb58d9ca9d5ea441d4561
font_01_sfnt_off00011f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 19924 bytes
SHA-256: 13ce683b421d65ccbb5f7131428f83531828691b9dd4b86d3b2809a5564d2a51
font_02_sfnt_off00015379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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