Malicious PDF — malware analysis report

Static analysis result for SHA-256 e038bc928a29257e…

MALICIOUS

PDF

89.5 KB Created: 2021-09-19 10:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f5b8169159532af587c9c33e924b9a8 SHA-1: 3603bb4e7ffd57b84b35eafa3fa487a875fae4ad SHA-256: e038bc928a29257e40948276dd19c704bee1ce9af0e13954c72a94d0c4736f79
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4519d05b---napumamobedulirar.pdf
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/16666726571.pdf
    • http://theexplorerthai.com/userfiles/files/jalomutimoveli.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/janasaxegobalorepokogeza.pdf
    • https://ingatlanfelugyelet.hu/uploads/file/4899073063.pdf
    • https://electrodomesticaruano.com/images/ckfinder/files/wogaboxubovunarenigazodo.pdf
    • http://autosklo.sk/pictures/file/dateri.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134682e2f998---71919811870.pdf
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210912135725.pdf
    • https://cyc-catering.pe/disac/userfiles/file/20459400567.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/xawatokuwukamefidoxik.pdf
    • https://hattoco.vn/images/ckeditor/files/85431370250.pdf
    • https://propiedades.net/ckfinder/userfiles/files/18584801830.pdf
    • http://adatarimhayvancilik.com/Images/Media/files/33007482538.pdf
    • https://livredart.com/ckfinder/userfiles/files/zenupig.pdf
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/pasilujofuduzozur.pdf
    • http://tostonet.cl/ckfinder/userfiles/files/xededokumabolajosamolana.pdf
    • http://ttmm.co.jp/ckfinder/userfiles/files/46743791720.pdf
    • http://bursaceyizgelinlik.com/images_upload/files/papexigurodiputanubuviri.pdf
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40610107837.pdf
    • http://regalmotors-jp.com/js/upload/files/14689962858.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/62426393471.pdf
    • http://1666-3668.com/attach/userfiles/file/27763878339.pdf
    • https://zlato-eu.cz/upload/files/keboxofexujolefum.pdf
    • https://stabiactiv.com/userfiles/file/mufofamenulenubodet.pdf
    • http://superbarter.sk/media/file/zerironalewamobu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=transformers+war+for+cybertron+ds+rom
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f30b.bin
22fa16a0dcb1ff648df0c4c9ad2dd01958bf33e9c24b7203067bce2d249f45eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 20384 bytes
font_01_sfnt_off00012762.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12762 16792 bytes
font_02_sfnt_off00013f79.bin
a25f9663f475f5709bb9d576b75d7f2552aa0cedb3c8430b4b439967b4bf966b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F79 10800 bytes

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