Malicious PDF — malware analysis report

Static analysis result for SHA-256 14728e610647c543…

MALICIOUS

PDF

76.0 KB Created: 2021-09-23 18:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bfab41b70172dda80a595ca944a91e2f SHA-1: 9e8318aa0ea9f52c8f18d66e40e8bc7b1b817d23 SHA-256: 14728e610647c543d24d76bf4daf5d04626059f3fb0febcd5f78afe426b91192
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, which is indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm on disposable hosting further supports a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://campfun.myhost888.com/upload/ckeditor/files/18239509827.pdf In PDF document text
    • https://dalycity.com/wysiwygfiles/file/76686515852.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/bijoxawajukep.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/neruteloriwarurafas.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/jesopugetutodavifosulavak.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/kanasipowijosup.pdfPDF link annotation
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bewor.pdfIn PDF document text
    • https://sim2007.com/files/regalikutawurakalideza.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/62428430091.pdfIn PDF document text
    • https://adikkedua.com/contents/files/jatojodiwatelamuv.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/jikojisoza.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/70634137423.pdfIn PDF document text
    • https://558com.vegner.com/userfiles/files/20210923_093246.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/28426715748.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/bugejemarazi.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/polisomupalawobuxafuvok.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/27661111094.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/tezoximifozez.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/2606321290.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/99166997029.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b49d94b095aeb8222df9a1752daf0b5/50976543709.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/bajoladibaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ocarina+of+time+3ds+rom+androidPDF 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_off0000c3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FC 10788 bytes
SHA-256: ff8c2965f8c809acafa05cd41539c195a42afb56cba82fadc3773c3a02f07eb4
font_01_sfnt_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 17480 bytes
SHA-256: c23254b2b760ed7fb94980d0f3d90b774443343249719f015899cb63ab856709
font_02_sfnt_off00010a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1