Malicious PDF — malware analysis report

Static analysis result for SHA-256 822df6b3bd06c4d8…

MALICIOUS

PDF

133.6 KB Created: 2021-10-10 12:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e8511d2e8a8d496fed64c0d1cb27ade7 SHA-1: 9ca71d45aa8907509545962a632d6ad3fe88602a SHA-256: 822df6b3bd06c4d8973cc65f4d82004a95dd8664bd1c6db1d5f8fb7a7a66f799
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicating a high likelihood of malicious intent. The ML classifier also strongly flagged this PDF as malicious. The presence of many distinct, potentially disposable domains suggests an attempt to obscure the ultimate destination or to host a large number of lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://garglob.ru/uplcv?utm_term=julie+andrews+somewhere+over+the+rainbow PDF link annotation
    • http://unitez.net/images/newtech/files/soluzop.pdfIn PDF document text
    • http://yensaophanrang.net/userfiles/file/57682321439.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///89766830090.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/70329057768.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/kitotuvoxanutu.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/budovakabivogepivojudez.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/xosefiluxuxolowimojafile.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/kijidetojapobelik.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/38284861841.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/pgna7p8ptlu32mqfkkrnfl8ms8/xutiranetimamijuve.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/17851425708.pdfIn PDF document text
    • https://777mto.org/contents/files/waromuvejonet.pdfIn PDF document text
    • https://lazerom.pro/media/file/vikixogo.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/pufoxizotado.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/xuxenofamovokanozeze.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/kelazap.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/gonitaj.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/pimofujujevusipexamofelin.pdfIn PDF document text
    • http://alcantara.cz/data/file/sizubemobuxafufedo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414e438f35---wesejedakuzedemifenunosa.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/28699870804.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/82100432224.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/134981859461452ebf1e5f7.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/zitoborije.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/3067918161.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_off0001a3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3F1 19880 bytes
SHA-256: 9e8b4163995bb80a8aab620756344365f6cafc5160e98a47f154a191844e7876
font_01_sfnt_off0001d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6F1 10896 bytes
SHA-256: b33be0e245ad66d330d6f17a15b62be6439933055ca84127f4f9e1c3d685e78f
font_02_sfnt_off0001f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1