Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93bc55c965b5da2…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 00:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c12b351935fb9feea7f05144c7c4233 SHA-1: 1f4ff4f103485111f81e3ffd4b0df0f4d793df64 SHA-256: e93bc55c965b5da2ea0be7483ba7100fc5ed4ccdf17a95e83e96639dd83a2e95
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=43+degree+wedge+distance PDF link annotation
    • https://loyallcanada.net/editor_files/file/kuxovi.pdfIn PDF document text
    • http://www.xzass.org/ckfinder/userfiles/files/46689153631.pdfIn PDF document text
    • http://esistore.be/userfiles/file/patediwijazujapomol.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/51442055208.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/bepiguvi.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/86790241162.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/24304326344.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-9/20210909185228152897.pdfIn PDF document text
    • https://synersys.fr/contenu/file/74610754556.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/manilupitoturufejemukag.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/kurujafo.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/tolirumezibojisiwogigusu.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/katujoxisitotunirojufab.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/80980725118.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/wugudewizaneri.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/penizuvafabo.pdfIn PDF document text
    • https://betsin.org/userfiles/files/51414346966.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/27893786101.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/83212701998.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/54738752845.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141c5eb5b39b---gatobiwu.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/37416417509.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/guboput.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/tonatixuxokuf.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_off0000b31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 17376 bytes
SHA-256: 40c20cbf88127a52c9d1b2060f1705a4bd16cf219ace9c3be697027d4fbf4e2c
font_01_sfnt_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 10616 bytes
SHA-256: b8480d771afd8e7dc5fd9d9808a759c8df6e45363a3c3748267985558a7a834d

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