Malicious PDF — malware analysis report

Static analysis result for SHA-256 659b996da350b5ef…

MALICIOUS

PDF

84.7 KB Created: 2021-09-14 07:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 655cfad95e26d47b5d879827673547d3 SHA-1: 6f9d31076fb7018c72a87c912b0a925d28410015 SHA-256: 659b996da350b5ef0a5c5943e553a30253e0cca985204df7f518fc44827a8453
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, potentially exploiting PDF vulnerabilities or serving as a lure for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=sorry+to+bother+you PDF link annotation
    • http://thaihotelsale.com/FileData/ckfinder/files/20210901_DF8F13393EE43894.pdfIn PDF document text
    • https://susta.vn/userfiles/file/70989393311.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/pupinefikurexenifuvifokap.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/vevesisozuged.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/58479456748.pdfIn PDF document text
    • https://tebra.si/userfiles/file/kibejubakifukobubigeseva.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/rufidijugulaxawesagapopip.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/55664085457.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/41353165307.pdfIn PDF document text
    • http://vuason.vn/upload/files/mefosibisuzodusepanaguza.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/lavezexev.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/32933615568.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/53407593297.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210911004712.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/nakemivugarifip.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0cf49740---61120733977.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/21627046629.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7c0ec3a9---18297107028.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/dapaxitutu.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/43666301221.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/37180182479.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109140630166935.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/warijawatekerakarot.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/18799545976.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/tebekoxudovatujesit.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/milimuputizebabatuxidupit.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_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 17524 bytes
SHA-256: ac496c34eeb03460ae2de534e149791db16150f5735cca11b95308d70a8b452e
font_01_sfnt_off000116f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F8 10060 bytes
SHA-256: 6f951d6fb92dd6037c8f08d82f181805a7d4baffcfc72fc25822fdc01c23dc62
font_02_sfnt_off00012d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1