Malicious PDF — malware analysis report

Static analysis result for SHA-256 8944200bdb1d9364…

MALICIOUS

PDF

90.6 KB Created: 2021-09-20 23:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e18d910a50681d0d9c984e8e68857b1 SHA-1: 9f8e217702802f8c217e4bedaf02eb9e05d077ae SHA-256: 8944200bdb1d9364f0ef77411a57590ce98b1a5728b24b89f8f5344c506e9ab9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm and identified by ML and ClamAV as malicious. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect users to potentially malicious sites, likely for phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://teusz.pl/UserFiles/file/tugigular.pdf In PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0c42a45ea---sijimuxisivox.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/6176492136.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/81968529634.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/96576076632.pdfIn PDF document text
    • https://norservis.com/files/files/mamebu.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/82537966072.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/lorobopa.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/69043184713.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/wikuwoberifiga.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pavawelijaxokuvemu.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/37109273071.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/04fe012ea072b425bac5ac0ec68f6587/86759255666.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/11560215345.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/mizazumeragi.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/31223566885.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/badedivepozowagirud.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/47261701048.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/zumejulilukaxawalubuzus.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/susagif.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/70310750772.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/55820435409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=iphone+6+pro+max+price+in+bangladeshPDF 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_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 11224 bytes
SHA-256: 00cc889a01521bf92c841a0ce2ac0304d03c2cfcdba1a1ce8a87213b5cda70df
font_02_sfnt_off00012a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 19116 bytes
SHA-256: 3ccd522940fd1236311e3b4fbbd4870f567890ad00b29f73fc6ed07013a2d2e0

Open this report in the interactive analyzer, or submit your own file for analysis.