Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26532e1d93f0f0f…

MALICIOUS

PDF

70.0 KB Created: 2021-09-20 19:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bc9fc8b1d4008e5ad073d9b6b05d9eb SHA-1: ac59acc54dbca3ff4088f2099281576008197cbf SHA-256: d26532e1d93f0f0f1174a13bdeb4fa2b0dd20d20be422d07ef5f28afc1f72223
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript points to T1059.007, and the overall nature of exploiting a PDF viewer suggests T1203.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://salt17.com/userfiles/files/21117383260.pdf In PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/64163732005.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/tufupatidanirufe.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/patigos.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/maxuwag.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/jexuwafe.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/47894164356.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/kuboxezenafafuxuteza.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/jamifixepodilijazifafu.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/wudujiladimepoku.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/rewoxozuzenapekukabenug.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/nupenokekobuvebovotaseno.pdfIn PDF document text
    • http://consade.com/userfiles/file/kanaxiso.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/gikijode.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/davipobixitubibox.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/79487046904.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/xelanusugupumazawagiji.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/kugoditawuketon.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/52658892361.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c34ac1724---8063841799.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/semusajib.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161424999af777---pemedabibabudurupa.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/64248763350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=minecraft+enchant+hackPDF 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_off0000b4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF9 15104 bytes
SHA-256: 1dbb95e2b743211250515dafbf3eae9bc17f3c2f5448bbeb224b40bf76d9d645
font_02_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 10184 bytes
SHA-256: b4b9649ca3805a1d426f24a94d2a1b3635de5c501f4b41cb8db571c4b6c34665

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