Malicious PDF — malware analysis report

Static analysis result for SHA-256 d214e68029b0da7e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-11 10:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc0eb3f00baced9f84c78f5676082fe3 SHA-1: a0604b2b19fcdf7fe0ece816f3780bcbd8fae0ac SHA-256: d214e68029b0da7eebdc23af3863026e0567c7f1599dd625d91d7802ce8f67df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the malicious links or to perform actions upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ct-tci.com/cttax/userfiles/files/zolakipiwinixewu.pdf In PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/42715953976.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/mukevemonilatalu.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/zomitevigodanenelari.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be874c1216---44896771587.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/42856680026.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/jilivazubinabulelul.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/mupopiletojujebawigunosin.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/16433478307.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/xalexiwapojofogabezinov.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/11337874563.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/gititotasibakotuje.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134640ac3ea1---tojerarajuf.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/lunipazigux.pdfIn PDF document text
    • https://ratoempat.com/contents/files/sumuzu.pdfIn PDF document text
    • https://trystsalonri.com/images/file/62290785610.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/kadakujifunoxorigeve.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/68626711452.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/fulosekojulud.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/lizuxuragusegowugolimi.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/xepegezibasuker.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/pelexukiliforob.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/49033302406.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/2459383377.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/sudikudubanakiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=couch+to+5k+running+plan+pdfPDF 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_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 16928 bytes
SHA-256: c5876830e95c9f44933e6469726b5736d6d4abbb20280fa157555b6b82e43ec1
font_02_sfnt_off00012585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12585 10956 bytes
SHA-256: fbc4d58fb5c4bfa056ff39194742d83aca48d85959394c98280a2af411a7a204