Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01d087246278e17…

MALICIOUS

PDF

78.4 KB Created: 2021-09-11 23:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e93a0f445a1b95c101354f80a923f90 SHA-1: e32c99b17ab691ede2e6f3739712388e07143d15 SHA-256: a01d087246278e17af3ce9c9599b10904af9a0c5580e6891ddc6a5b6e955fc7c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous unknown URLs found in the document, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://njbeihang.com/uploadfile/file///2021090520273056.pdf In PDF document text
    • https://afritransport.com/app/webroot/files/file/karovujubuwokolibijipu.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/jogosamevowi.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/sufodivavelulewajeb.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906063428780.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/33162869903.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/linufekifeketipa.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/gusowijatefixolavejef.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/junok.pdfIn PDF document text
    • http://haai.org/upload/file/togovog.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/32386280997.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/md5dmic4hh8am3e4r5dqqelrjr/vujorapusexe.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/vovujotobegefepixubigugu.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/relodokibititanejirivu.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/97355201928.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/26948461793.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/fofivetawetigoxused.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/1782719220.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210907012134.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/58069100236.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/94908874940.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/gidafunewafidupi.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/juvum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+long+can+thawed+chicken+last+in+the+fridgePDF 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_off0000cc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC73 17836 bytes
SHA-256: 5bf85b1c4346d96b9730ba4ac23252ef5dd5bfc0253a77148e2c59b349d81284
font_01_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 10924 bytes
SHA-256: 80b65f282fefcc26f7cbaecdfb919493d9e24b9019508a9cb28d4af1f21f55de