Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c821625a0a6c55…

MALICIOUS

PDF

92.5 KB Created: 2021-04-04 14:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bde6e012c42c4a0efa31a8a72e28f49 SHA-1: 4a73cb147153083967fbe5d313af6b07cae24ee3 SHA-256: 63c821625a0a6c5555a6e082a45ca81c4aa4842f1265a9be359b784b7f2954f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm, with the primary purpose of directing users to external websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to leverage SEO tactics for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=anima+weapon+list
    • https://cdn.sqhk.co/legusovej/4jbnjfl/godsmack_keep_away_acoustic_chords.pdf
    • https://jokanile.weebly.com/uploads/1/3/5/9/135962808/depiteda.pdf
    • https://cdn.sqhk.co/janonaset/T9sjghg/roblox_toys_series_6_release_date.pdf
    • https://vawisopikev.weebly.com/uploads/1/3/2/7/132740649/bivigulil_dazimekimovator_dawulolit.pdf
    • https://cdn.sqhk.co/rorazelesu/fKjjesp/popscene_music_industry_sim_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fc96af36-fd36-4422-a6bc-37cffd0772df/18068267972.pdf
    • https://s3.amazonaws.com/gebukil/27622293091.pdf
    • https://s3.amazonaws.com/dibedamoka/wazexiwiwilalinamalazut.pdf
    • http://bisavosimirot.rf.gd/xazidizusewusagabakogiper.pdf
    • http://rojelolazekozox.rf.gd/trauma_de_abdomen_en_nios.pdf
    • https://uploads.strikinglycdn.com/files/3ec3c150-b9a3-41ee-9751-a379941080ba/months_of_the_year_exercises_for_kindergarten.pdf
    • http://duvexarido.epizy.com/fluorite_structure.pdf
    • https://s3.amazonaws.com/bokelur/45813832005.pdf
    • https://s3.amazonaws.com/lezerawe/n._p._r._c._ka_full_form.pdf
    • https://s3.amazonaws.com/povelenavuviw/85148360720.pdf
    • https://s3.amazonaws.com/gizonukorad/tomurebitajudiliwujufivil.pdf
    • https://s3.amazonaws.com/mefonevimimix/pearson_baccalaureate_essentials_global_politics.pdf
    • https://s3.amazonaws.com/gedexim/how_to_change_battery_in_weight_watchers_scale.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115c6.bin
ffba7301cd994139b1464c578334615742358604b1c322b5b72deeefc56958b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C6 4952 bytes
font_01_sfnt_off00012696.bin
bf77f31c184176d0987908a081975c21a5659d939fccddf7aa1bb9a362c250df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 11876 bytes
font_02_sfnt_off00014e65.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E65 16092 bytes

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