Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cf6fc9d1f0971a…

MALICIOUS

PDF

102.3 KB Created: 2021-03-28 02:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1554d305da2606f65846cb4c4acf5905 SHA-1: 7dc6c835c252b053609ed53bfd301c8c7ecd12a3 SHA-256: 72cf6fc9d1f0971abbaac26f2d98857224f183cedd46390d196fca6b45304766
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting, and is flagged by ML classifiers as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Facebook marketing strategy pdf'. The primary attack pattern involves redirecting users to a link farm, likely for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/award?keyword=facebook+marketing+strategy+pdf
    • https://cdn-cms.f-static.net/uploads/4474192/normal_6039c0fc7a00d.pdf
    • https://cdn-cms.f-static.net/uploads/4367959/normal_60226edea9221.pdf
    • http://feremujidonigu.getenjoyment.net/bsa_camping_checklist.pdf
    • http://berezarivire.iblogger.org/wages_board_ordinance_sri_lanka.pdf
    • http://wefufivubulal.medianewsonline.com/mother_and_baby_animals_worksheets_for_kindergarten.pdf
    • http://lagejarejitog.mypressonline.com/xekuxilinabufisadesetar.pdf
    • http://vurovolapoza.mygamesonline.org/rulozotidojutisifinadi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_33addb9a08744941a1c90d6078260d2e.pdf?index=true
    • http://wudemexa.myartsonline.com/27714092089.pdf
    • https://07a970a6-a864-461d-ba0c-8deda34efc75.filesusr.com/ugd/b56c0d_b3f62495293d4dd88fa26e2a639fb36c.pdf?index=true
    • https://s3.amazonaws.com/vuliwisuwig/ikea_malaysia_catalogue_2018.pdf
    • https://s3.amazonaws.com/sefipa/1158247079.pdf
    • https://s3.amazonaws.com/wokesabisevo/revinotumun.pdf
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_f168456fb34d448c9f51a6764aea8144.pdf?index=true
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_f9c0427faab64484b59f931d1b2bc633.pdf?index=true
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_451371d46f144b418007584d6c7cab33.pdf?index=true
    • https://f92484db-e5b4-41f8-9431-508412042773.filesusr.com/ugd/b04c15_d1630aea3fb04211bd81c0b1a99f0a63.pdf?index=true
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_14c94ad5967442a9819333fc8c23a29b.pdf?index=true
    • http://tavupovasar.rf.gd/duberajufoxewedezufe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cdd.bin
b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDD 6588 bytes
font_01_sfnt_off00012d57.bin
decf2c12d32d755a28de649bbd85913e080f05a744c3a038f8ce0d6f1bf9c35b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 5704 bytes
font_02_sfnt_off000140ab.bin
ebc0a69493f1093b674e24f0917724222b32218ce8ecea701c3c6bca19b30cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140AB 1924 bytes
font_03_sfnt_off000149e5.bin
3b4ec750ddd56657fc3df52ab484c7c9b4e36fb52fde449e0e39f6043cd0558f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149E5 11632 bytes
font_04_sfnt_off0001719c.bin
52504450acf81a48d342fdf151a1a3b3aea2f6c8a21e6a807bfb4fddad8e9334		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1719C 16896 bytes

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