Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d144bae3e6cc7ad…

MALICIOUS

PDF

76.5 KB Created: 2021-09-09 03:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3845588b788402be963a6e927d424a57 SHA-1: 203b91aafe7e449bb1fe959279fca09056607b19 SHA-256: 5d144bae3e6cc7ad5ff6fb2f96c42e78f1c92c455169b4fb59a0e7c1d227b2a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on potentially disposable domains. This behavior strongly suggests a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://aktasmatbaacilik.com/resimlerfiles/892298600.pdf In PDF document text
    • https://a2designbg.com/userfiles/file/50127981205.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/fekesodulazuguti.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/dexut.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/fofabalafotexotima.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/xoviralimutupem.pdfIn PDF document text
    • https://papiratisk.cz/soubory/kosimejivomujor.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/wurer.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/kasifo.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/dujifazowidotupe.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/3108747002.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109021203245862.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/tigumizumebirogivezukow.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/kumunufekufuxonewegaxaxi.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/51716792708.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/29066009883.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/jetigobexirizesi.pdfIn PDF document text
    • http://merwepizza.com/upload/file/33129102771.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/11924218276.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/65412608124.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161363bd569ada---xizesutorijuju.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/42017877148.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/52717847959.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/4375002259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=replicas+streaming+vfPDF 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_off0000c381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC381 18588 bytes
SHA-256: 7503e227ed58b6e7f09602d1e70dd336d2888f4461bf404f84516dc616a1b28a
font_01_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 10812 bytes
SHA-256: 078ef4690123c79f6277b8b3e71379b187a63eea97d28d4005b43a5d4894d22b
font_02_sfnt_off00010ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1