Malicious PDF — malware analysis report

Static analysis result for SHA-256 705e25572757d6ea…

MALICIOUS

PDF

75.4 KB Created: 2021-09-18 07:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ad2da0fee21ed5eaa3505210ad2c216 SHA-1: f3f481f5e7b74129879892ec8e4d47a59929e379 SHA-256: 705e25572757d6ead5dab6ac960a0f8b9bb2dac756354af4c0fcd2dc73338684
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially malicious or disposable domains, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pure-chiral.com/upload/files/kirimavuzumabazunozometul.pdf In PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/nikazekid.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/kapisir.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/dugirowu.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/44979816731.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/gikupan.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210911145050.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/jegoxew.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/voxiginoxepozaretug.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/gozikofuwemopeliw.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/4935352003.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3de7466bb---3851173736.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/pudesogurijolunaxob.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/buvegibewumaw.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/48919499988.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/loboxonufodumasokorit.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/9374854871.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/98228627857.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/50461963516.pdfIn PDF document text
    • http://keramann.ru/uploads/files/14293977691.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/jopagomoxajasejuvulato.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/15547962156.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/50122621319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+good+doctor+season+4+putlockerPDF 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_off0000c483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC483 16464 bytes
SHA-256: c4c8d228b84c54103ae35736f0a62bd71d35229b6222883e73de5777a426bb10
font_01_sfnt_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 10932 bytes
SHA-256: 9f1f906d3690ea9e8f7d4a24855efc19f0ad258e01997068682c99259bb9a60f