Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a117b0ea55eba61…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 23:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 99c676e3d9594611fbb6882f96f4defc SHA-1: 73c5959eb104a430a2d2a01a2955e5c90c9fa838 SHA-256: 4a117b0ea55eba61f38cb971a352ea4e0bfb49eeb67b22520d19e39c296fa6b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous suspicious links found, including one pointing to 'garglob.ru'. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

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 https://garglob.ru/uplcv?utm_term=add+image+to+mipmap+android+studio PDF link annotation
    • http://parfumland.sk/upl/91015096224.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/lejarola.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/jipid.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/dafomad.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390f56befdd---92755317450.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/36437887676.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/kapirazexomuti.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/52096709175.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/nifobunoje.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/35048551559.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/sifumalurinilatixiwefiz.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/jufedojukozuraped.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/43197517807.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/rigivonox.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/noribuzotujiraborerub.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/87450340336.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3421c4a8f---33115661565.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/46270161061.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/34183606600.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/gifabidavunerezetajekori.pdfIn PDF document text
    • http://xtra360.net/campannas/file/nufejitutipiwemujowi.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/sulesemas.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/zibexinenepefatof.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/4808052321.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/72269630959.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_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 18312 bytes
SHA-256: 24dcee46b0aa6805f51601795888cf5a4db0ee19f2bbc7ddd8bc2f1e7a525e1f
font_01_sfnt_off00010f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001274a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274A 10772 bytes
SHA-256: ec0e4ab7452d9659a9894895a9fc22906072c3784586566f66ed0df272b6dbe1