Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab64311a1ee8afe6…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 16:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f4965bdfc194b030367423e14ec6b47 SHA-1: 39f7d3147e3e372bfb1e4cb5728ae09652e90410 SHA-256: ab64311a1ee8afe6d13824537c85f54205a2d7c657752a6e2bc1f7cb1e99c920
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://gidaero.com/upload/fckeditor/file/mimubafevosafulolub.pdf In PDF document text
    • http://okudshava.ru/userfiles/file/zurexivofogebik.pdfIn PDF document text
    • https://davnosti.ru/upload/subojomu.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/kisipiderapobonit.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/tirogasabasovoneze.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/45433802427.pdfIn PDF document text
    • http://www.puhito.hu/uploads/92481641221.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/virajebataneresaxifut.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161372b62e199d---putolebamijigifemimoletaf.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8cac4253e80823538614bcd38aa3a648/xexutugibutuxasanod.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/zewobelunotosikejidena.pdfIn PDF document text
    • http://terminsk.by/pics/files/70461855120.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/vasajonog.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/miroka.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/29668424515.pdfIn PDF document text
    • http://centronegozi.com/public/20124282257.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210903_C9D5303BA59E4C94.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/daluje.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/vapuwowepunowe.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vojufunixukafufefiniguvup.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/21665471093.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/fukepem.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/kusope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mp4+youtube+downloader+androidPDF 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_off0000c1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D3 16524 bytes
SHA-256: f1129b4399b79e1649b723a64ad2ddeb1fe0f940f04162dcdddb932d73b77a37
font_01_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 10728 bytes
SHA-256: 3043e59b97876182d472db74d0cba7632fd5a8abca08578d31eba74980c62c4c

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