Malicious PDF — malware analysis report

Static analysis result for SHA-256 661908ae05a0c5d8…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 14:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 05c41fbd61c2cf1231d3bddb7ab42056 SHA-1: f094ef01e0cd291a1e8c4a1fad72a01a1f4438f3 SHA-256: 661908ae05a0c5d8b38b761a1277bd8de3699abdf9ecb88c9c03c056be6456a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of embedded JavaScript and numerous external URIs, many pointing to PDF files on potentially disposable domains, suggests an attempt to redirect users or deliver a second-stage payload. The document body was unreadable, but the heuristics indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kligi.viart.lt/ckfinder/userfiles/files/58286594375.pdf In PDF document text
    • http://simsvizag.com/contentimages/file/xekuz.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/befolewigebev.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/60487073035.pdfIn PDF document text
    • http://www.buildonhope.org/file/kizoxuboxunagozifab.pdfIn PDF document text
    • https://10fci.net/userfiles/file/varogorarijamij.pdfIn PDF document text
    • http://rc-modeller.se/images/file///ravepevutobaduw.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/xebomaf.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/57761929625.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0640c11e---fikapedumidenad.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/93031206652.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/92338670366.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/88906450472.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/89975880872.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/17852711575.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/metowafaxa.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23571472636.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99c70bf81---78736824326.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210919_C6851BBD28F7FDFB.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/favelaxezesigir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+solve+download+pending+problem+in+play+storePDF 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_off0000c2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A4 18128 bytes
SHA-256: d81a002a8e9e3e2be16a42e081b2dc2c713ff9bc6ebd7656c0a340dc62c119ab
font_01_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 11132 bytes
SHA-256: 0b0916ad84bade273a2008d20e695bbe21e66d514eccfae1d728bfa56cf892ca

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