Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c687c1ed151f1d3…

MALICIOUS

PDF

75.0 KB Created: 2021-04-01 13:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5707d6974afc6074256fdc028dbd885c SHA-1: 6b7936494a7167285bd89b7500a92f7feb033ece SHA-256: 5c687c1ed151f1d3200afc0cd7c4d88b0a60cb0dd6cc28f177b87080a3d52677
154 Risk Score

Malware Insights

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

This PDF file contains a link that redirects to known malicious infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier and ClamAV detection further support its malicious nature, flagging it as a phishing trojan. The embedded content, though heavily obfuscated, suggests an attempt to trick the user into downloading a malicious file by masquerading as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/award?keyword=passport+application+form+canada+pdf
    • http://bajesiradevo.getenjoyment.net/70351797474.pdf
    • http://gaxuzafepuwe.iblogger.org/95196545923.pdf
    • http://kuxni.su/mupawurufasekicj2pv.pdf
    • http://tanuwoxomasosog.22web.org/25848911435.pdf
    • http://luxisulejoxo.getenjoyment.net/agamemnon_script.pdf
    • http://draiwenstore.online/holt_mcdougal_larson_algebra_1_common_core_teacher_editionnr40f.pdf
    • http://all-host.site/xixoradajokidedesazitwyko.pdf
    • http://logvoz.ru/noriwi2jjyx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_f6ea151104864788ae57d496d9ba999d.pdf?index=true
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_9c5ed004109148cda43c5596da842d2d.pdf?index=true
    • http://xemunebo.atwebpages.com/microsoft_project_tutorial_video_free_download.pdf
    • http://muvusibose.rf.gd/fajorajijijo.pdf
    • http://vezavajizuvos.epizy.com/jobs_hiring_part_time_night_shift_baton_rouge_la.pdf
    • http://fafezevasuba.rf.gd/vudiwifagoj.pdf
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_170fa131f53a42d78da7933b63b10048.pdf?index=true
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_9216ed4679cc4a97abf9ff74bfd3408f.pdf?index=true
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_5f727e9427444118a12e1c430d51e1cf.pdf?index=true
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_3794757133db40d98a8269d6ac8c5fc8.pdf?index=true
    • http://povujijizota.epizy.com/how_to_reset_my_ao_smith_water_heater.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee43.bin
935cd1f1e2a3e38b8775a9b21fe3933f59dc466272c5fcec571d4d984f0d67b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 5300 bytes
font_01_sfnt_off00010034.bin
2e60590008cc6c93c0c44d1bdbde83905665dff4c1069292081e3ed483859c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 11212 bytes

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