Malicious PDF — malware analysis report

Static analysis result for SHA-256 835eb402f388678c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 16:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad64e1351c534564de505198a131961c SHA-1: b8afa97b19a8ddab00e899824a6eec4672da70b7 SHA-256: 835eb402f388678cb9af7ea09f5d365021459a6551b9cc43501619bcff0b74b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to direct users to potentially malicious or phishing sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pro-roubenky.cz/UserFiles/File/zutupuwumodup.pdf In PDF document text
    • http://sxnqx.org/upload/file/Fl202109070655549015.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/lezumomomunojakusamoda.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/kesokokobowaminor.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/31346490379.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/gomofenafedevebe.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/36071210508.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/lufejap.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/kazutiwivodagupapikedub.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/9341678364.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pabafukiloratemino.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/levevi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161399c6b9abb8---mujezugubitajovoliboj.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/bufijibe.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/zigaxanarimusogilonu.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/60616902958.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/82368569926.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/xaledapazomatavedu.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/83409137992.pdfIn PDF document text
    • https://everestart.com/images/stories/file/walemipifipifugaxomijawil.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/88764461551.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18658261126.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/t3skt58bnl8u5u4t742un6sbg1/bedepowelujakipojiregigaw.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202195946399409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+app+lock+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_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 10628 bytes
SHA-256: abeb4cf269b4d3734d97a3788903f479c3cc6258ba5938b8d51a0c7008c9d962
font_01_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 17812 bytes
SHA-256: c78d949bc9412887727a69b5b342600a489ef024d63c12f570d900885f7ea65d
font_02_sfnt_off0001200d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1