Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19f077245771abb…

MALICIOUS

PDF

98.5 KB Created: 2021-09-24 04:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1058e8996a4946cd45f685a28e3892d9 SHA-1: 45be2344654a90657bbb2fc7b0d8ae381fa7eb2c SHA-256: a19f077245771abb2cbb0e4e503f6918ae23afae3844456e08b772dd1b73799d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external URIs, many pointing to PDFs hosted on disposable domains, suggest a link farm designed to redirect users to malicious sites or download unwanted applications. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/71005929115.pdf In PDF document text
    • http://thegioimercedes.com/upload/files/79312295156.pdfIn PDF document text
    • http://mayjack.com/upload/files/92868148895.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/12624186873.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/32862300076.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/tiginopufoxiwiriluzonuraf.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/puzuluxopud.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/jemidezebafewev.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/bivigiwavefakudi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e83bd816e---96260690179.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/6123477047.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210921210758_2026016483.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/69998926868.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/21683412343.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/89179640923.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/44335839383.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/1c1a12527067f44b950755a2760caee2/10165771530.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/kopepupi.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/68104977611.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/fasadagomiwuxu.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/35443651747.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/31355161483.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/57847772259.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/32301073511.pdfIn PDF document text
    • http://fitviewer.info/files/file/98917429968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pro+cleaner+apkPDF link annotation
    • https://easyown.ddproperty.com/datas/files/70335858414.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_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 18176 bytes
SHA-256: 28e4155c0783126b616b0c1948f0afb9e8ed9276598ee9bc489757f64982a3ce
font_01_sfnt_off0001361c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361C 17752 bytes
SHA-256: 673eda63046774c65881e90b40a30263db3fc8b6053419d80a25d78aeaa858c4
font_02_sfnt_off00016444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1