Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b7f9770ec3842b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-23 17:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a7660a28a1d8fdfd3e4cf0ff99c855e3 SHA-1: d78e6c14036547f8427b2fd0eca68f8db894752d SHA-256: 05b7f9770ec3842b57ae8767f5c31be87933f1132c2121eb53152b59cc0e65ef
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The ML classifier strongly indicated maliciousness, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the suspicious nature of the embedded links. While no scripts were explicitly extracted, the presence of many external links suggests an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 4

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=house+on+haunted+hill+123movies PDF link annotation
    • http://minhquoc.vn/ckfinder/userfiles/files/6979848194.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/47083304786.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2047459f---fabebife.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/62822399436.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/64863685231.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/52128761860.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/87431789094.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/davapotebedomokesurina.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/10958620206.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/95227413821.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/16287280042.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/fiwubobo.pdfIn PDF document text
    • https://moolans.com/uploads/files/51479049491.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/jetolexed.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/mamudojufijogajezo.pdfIn PDF document text
    • http://yilip.net/userData/board/file/9765528041.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/2362866587.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/3647581239.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/merajolubariw.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/38119592709.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/worom.pdfIn PDF document text
    • https://nuteuit.ro/ckfinder/userfiles/files/79141927874.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_off0000b4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 15664 bytes
SHA-256: 820f69d9bf4c7c34c5dd52e950c0d2cc9e116d9367805d08359beb2e3f1ab4e5
font_02_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 10912 bytes
SHA-256: a86a70f2d7d0b151d789b64f6b1c83d610788dbc52f5bf37c29e8d76eee9bc38

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