Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d00cf0b60a35e3…

MALICIOUS

PDF

73.7 KB Created: 2021-02-04 13:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e8f38d769a3425e037529867d789a553 SHA-1: e7976a11516135a1bc2221263cda3b45c292b6fd SHA-256: 66d00cf0b60a35e3b3ac0d8e75ee9fb621f5ac63542abfe7a1cee410e0451b43
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to filling out an online job application. The presence of multiple external URLs, including one specifically related to 'llenar una solicitud de empleo por internet', reinforces this phishing pretext. The embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=llenar+una+solicitud+de+empleo+por+internet PDF link annotation
    • https://cdn.sqhk.co/lazuxorus/gd4jeMQ/xmeye_windows_10_download.pdfIn PDF document text
    • http://detonic-italy.website/49339587464o4fpd.pdfIn PDF document text
    • http://sellforce.ru/township_game_tips_and_tricksqy70o.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/ZQ9ijvy/live_stream_nfl.pdfIn PDF document text
    • http://tk-pobeda.site/scattergories_lists_13-18_printablealq7x.pdfIn PDF document text
    • http://bawoputameded.iblogger.org/acer_chromebook_r11_user_manual.pdfIn PDF document text
    • http://womenit.space/positive_and_negative_effects_of_globalization_in_the_philippinesencc6.pdfIn PDF document text
    • http://stnold.com/mikecrack_minecraft_escondite_2020ujs6q.pdfIn PDF document text
    • https://cdn.sqhk.co/nunewole/c2jyhaO/skater_kid_costume.pdfIn PDF document text
    • http://leyloften.online/chemistry_class_11_ncert_2020cqtia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pebulibupa.rf.gd/jigigunaliravovixoro.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/math_worksheets_for_grade_7_simple_equations.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/pefoniloxude.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/nox_android_emulator_vs_bluestacks.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/reading_comprehension_worksheets_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/ubuntu_16._04._6_desktop_32-_bit.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 5040 bytes
SHA-256: 5752b0589dd037236f07275d8ba25b3c9ba39b6f14c5e5b668707ee64a8f74a8
font_01_sfnt_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 11196 bytes
SHA-256: 4765527822ab1a11550641cc3f84892f0633992c9791ae1862a72fd710fbdf04
font_02_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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