Malicious PDF — malware analysis report

Static analysis result for SHA-256 e858ec120a40aa9a…

MALICIOUS

PDF

200.9 KB Created: 2021-03-02 22:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 41e3614c661be0e9fa186ddde7df6c25 SHA-1: c38bd665892472cb8841e09119262a6a820660be SHA-256: e858ec120a40aa9ab38946eaa10de4cb2d74b6d1bfc31ead313f01df10059448
136 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains multiple embedded URLs pointing to potentially malicious domains, indicated by the 'SE_LOLBIN_RUN_COMMAND' heuristic and the 'PDF_URI' firing. The presence of these URLs suggests an attempt to redirect the user to phishing or malware distribution sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://pelibifir.ru/aws?utm_term=nieve+de+garrafa+san+diego PDF link annotation
    • http://henrysavbr.site/is_chi_shampoo_good_for_curly_hair617r0.pdfIn PDF document text
    • http://sq11mini.com/429655295960wt5w.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/kadunila/iaBhhSk/hello_neighbor_hide_and_seek_walkthrough_nintendo_switch.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/ponesigis/g6difuG/hilda_creatures_game_guide.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/10860255744ud1rs.pdfIn PDF document text
    • https://cdn.sqhk.co/sebelokili/jhhfvLe/subway_3d_endless_runner_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/22402011973.pdfIn macro / runtime command snippet
    • http://vexifebama.rf.gd/aristotle_poetics_free_download.pdfIn PDF document text
    • http://gevekesudizare.epizy.com/lamborghini_full_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/malformacin_de_la_charnela_occipito-_cervical.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/mepalu.pdfIn PDF document text
    • http://gilovimarej.epizy.com/nedefisuzewofuvosad.pdfIn PDF document text
    • http://wotixoweg.rf.gd/jododupufidotapot.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/jawibilireze.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://scripts.sil.org/OFLIn 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_off0002c226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C226 5072 bytes
SHA-256: 85dd1ea9136432baa4e9ad080f509c3ae9d831d77f2e845729e4d4d8969fcb41
font_01_sfnt_off0002d389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D389 13768 bytes
SHA-256: f008a1a271abda14586bc61e2aa49f39dc259a2cb51570525f5782c9ca3549cc
font_02_sfnt_off0002fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEA1 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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