Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a0daec37b73a85…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 13:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92b4b097a201cfbed12731c80fa176a2 SHA-1: dd246c08a13b1ad7bec9fb2b6901690f2d3a726d SHA-256: c1a0daec37b73a8580e6a21d348f61b7a93ada8d334f50ba665280833c245b61
166 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it contains numerous external links, with one specifically identified as a random URL on a disposable hosting service. While no scripts were extracted, the presence of multiple external links suggests a phishing or redirection attempt, likely to deliver a secondary payload or lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://karpataljaturizmus.hu/upload/fulapetubigeziripa.pdf In PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/29408965397.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/mitowi.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/pizafigumex.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/dinaparujafope.pdfIn PDF document text
    • http://c-six.it/userfiles/files/11472964697.pdfIn PDF document text
    • https://majubesar.net/contents/files/betaxedikerajotife.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/fonilenoduzemul.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/29902340722.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/62946848588.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/juvopikiges.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021982048165387.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/kakabimagomizi.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/14344923510.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ritezezikuga.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/futipipelibube.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccbe594004---kagumuretazumekaboje.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/buruluxasu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/aeff9b862bf181131d1708a90b6babca/19039858918.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/zudaw.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/30706231548.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/77252474072.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/89305048123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mobogram+telegram+for+pcPDF 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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 10592 bytes
SHA-256: 22317e93477c2cd6e05247c82e3d6efb88b825c56d01bc6e305dbbb7fad85323
font_01_sfnt_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 18980 bytes
SHA-256: 447d495d96575cafa53d67430c245003c72579397f39f8a4d0d7633a8b7416b5