Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bda4cc03d728416…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 04:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39c69b647b15f6acbff4736abb672ebe SHA-1: ece63a9daeb5c89e8fd356c44bab4e3331ce7bdf SHA-256: 5bda4cc03d7284167e20e86dbf238a5327da890613a508ee2986057812d8ccb5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=how+to+hack+free+fire+diamonds+using+termux PDF link annotation
    • http://bischofs-scheune.de/userfiles/file/23248831463.pdfIn PDF document text
    • http://czyxchem.com/upload/files/kibaf.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/229276420.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/wakovorurujulejafana.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16309469522064576297.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/26854890306.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/nekezurejonopakiwi.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/liliwozububuruzukuledomo.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161316632dc633---vedapozuse.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/tesutitexedakut.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/4415508102.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb4b2778a---seroguvadeseribimo.pdfIn PDF document text
    • http://classtool.info/upload/files/gerizijupiresolijikezupi.pdfIn PDF document text
    • https://defi128.com/userfiles/files/47407314007.pdfIn PDF document text
    • https://ibericadearmerias.com/file/48282052835.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/dinasizivedopixugagawi.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/kemokemowenerala.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/88357786339.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/14240813226.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/5862923208.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/vazakefivikexeku.pdfIn PDF document text
    • http://soc-in.com/data/media/files/morupoxugomusi.pdfIn PDF document text
    • https://airshow-bg.com/file/vadawi.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_off0000cc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 11248 bytes
SHA-256: 38015f4da8e31a6af53581db3189509cc33d2dcc295f6f3e1e6d463e3beeb669
font_02_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 18320 bytes
SHA-256: 34bd5e572ebc87705c15e9a153ffbbf78877c66203b8149fc1fd774378211f3b