Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f738c496a005a7…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 19:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d1c0aa1f2eb9e80d788884d42c44301 SHA-1: a8590f722c0669af574cc99127b258ccb5eef4a0 SHA-256: d0f738c496a005a7ac8922dfa01dfe3f29947e4e12da79141f5d620dbc8af7d4
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of link farms or SEO spam. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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.lukoilmarine.com/ckfinder/userfiles/files/5273289715.pdf In PDF document text
    • http://daeryuhealthcare.com/ckupload/files/70462379394.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/kafodi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613225646a3b9---14269317564.pdfIn PDF document text
    • http://www.grifin.sk/files/mejilononojixogadi.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/sukazujagamev.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/62414549819.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/88311586621.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/77558289580.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/dodisetuvupeged.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/40658492238.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/kodojivuna.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/lojevuzavimolebotap.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/79932936574.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/livaxazip.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109071503446734.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/96503935026.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/52859555641.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///losadotejusalulun.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7n5mtdshbu2vra23c9o6kch0ov/78016949519.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/61597893734.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/63950624537.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/lujizigunesas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hike+plus+messengerPDF 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_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 17836 bytes
SHA-256: 05785d12c750333aa7bbe782c3884a33cfd598e4c0c33648dfce348cd17dfcfd
font_01_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13120 10400 bytes
SHA-256: e6f0bfc1f4c367f420caa1c71561b0f2473ecfe1d0ec47b9fe6f170cb961731c

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