Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfd9a899eb67c30…

MALICIOUS

PDF

71.7 KB Created: 2021-09-20 12:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9977ad3757ca0a32a7b2ebae5ab8caf1 SHA-1: ed30ad683fa9f7d1083e508da1a40f22856d1d11 SHA-256: 0bfd9a899eb67c308fa7cb9d41dcd49227e8b9dd3900f2eb4785afa2c35137a5
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malicious content. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of numerous external links, suggesting a link farm or redirection scheme. No scripts were extracted from this sample, but the overall structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=video+transfer+from+iphone+to+android PDF link annotation
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/lisolubefovabisorakamafu.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/paxibanopepotodugoji.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/95770552681.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/memokavizawepezogajabam.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29c48da93---39586835255.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/segudunavatigosi.pdfIn PDF document text
    • http://mgrima.com/files/file/68068507636.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/63524396148.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/xujonalutawovi.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/93499164924.pdfIn PDF document text
    • http://greenglobepms.com/uploads/42399862496.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/xumilelid.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/botel.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/tonadomerof.pdfIn PDF document text
    • https://fond.ru/userfiles/file/logowineb.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/60823368685.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/safatamap.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210906121443_rs8g3r.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/18963831563.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/77141369163.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/komit.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/5476935970.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210916101808647.pdfIn PDF document text
    • https://satesayap.com/contents/files/femuz.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/dujurilumis.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_off0000b824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB824 15860 bytes
SHA-256: 0320eb49b2810567ed48afdf145ec917a29847ee4c5388a448c6eaccc9df539e
font_01_sfnt_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 10688 bytes
SHA-256: a468d14e358e4f2f5386598e396a8ef0fee58a0f194bf2b14595b6216a576e5a
font_02_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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