Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe959fe4d435027…

MALICIOUS

PDF

89.2 KB Created: 2021-09-15 21:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 795e0f0ea756e5e921b115217490817b SHA-1: c984df24e5fda668aa4e69ad717c37f6df4b8448 SHA-256: dbe959fe4d4350273621c32056dab9acd520546370967141ae1a4db1e767761f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to obscure the true destination by using a large number of distinct hosts. ClamAV detection and ML classification confirm the malicious nature, suggesting the embedded JavaScript is likely responsible for executing the malicious payload or redirecting the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://alternatifhirdavat.com/upload/ckfinder/files/vemulevezuruzikegezumamaf.pdf In PDF document text
    • http://osayit.com/images/file/goras.pdfIn PDF document text
    • https://ntc-container.com/upload/files/98941098607.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/30865773483.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/duxixawoludapamugo.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/23663530184.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/47357064711.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210903012250225375.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210914150037.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/lagopekasadidenagitebuv.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/88817435188.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/wakotokos.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613434223b11d---ripewojafofis.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/gidixoxanudagobol.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/28412719624.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/fapagavibufolisamefebi.pdfIn PDF document text
    • https://rajaunited.com/contents/files/kexibosana.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417506251c2---kurusadozosakesijuxi.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/misibekademavoxawit.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/26275875443.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/paniretewezigexerinev.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_07_18_59_36_3706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+government+alertsPDF 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_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 10640 bytes
SHA-256: dff6b32b86b3ef93c0c368d916732094a996effb074b64d64c819ac1c95900ba
font_01_sfnt_off00010e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 18804 bytes
SHA-256: a0eb1c971b7fa93095b8de4093d0b4382e3587931c59bd64a45f54808910eee7
font_02_sfnt_off00013fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1