Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d27758d179dc61…

MALICIOUS

PDF

75.1 KB Created: 2021-03-07 10:05:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15a0e7d391c823576b29939616015ade SHA-1: f920bea4e0ddc2e0f28821a9b54f8078316958ad SHA-256: 50d27758d179dc610a483b07326e88d9e35cfe81dd2da578d22e914863ed07a6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it contains external URIs and lures the user into executing commands via copy-pasting into a shell, a common tactic for phishing and credential theft. The document body is heavily obfuscated, but the presence of the URL and the heuristic firings strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gimoguvi.ru/aws?utm_term=goflex+home+reset+admin+password
    • http://bezugunafagomup.22web.org/audio_to_text_apkpure.pdf
    • http://penodesige.iblogger.org/michelin_guide_vert_seoul.pdf
    • http://dulexip.22web.org/conditional_sentences_games_worksheets.pdf
    • http://mulemepifapevu.iblogger.org/big_fish_casino_class_action_suit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/accc886b-25f6-427e-9e02-73cd86eb0fd1/how_to_reset_the_time_on_a_sony_dream_machine.pdf
    • https://uploads.strikinglycdn.com/files/6370799a-f734-4cbb-a377-e2045f5f580c/my_cloud_library_app_is_not_working.pdf
    • http://guxudapese.epizy.com/92624546536.pdf
    • https://uploads.strikinglycdn.com/files/d1c8fce5-257a-41fa-bde3-a919f340aeb3/kitokifefif.pdf
    • https://uploads.strikinglycdn.com/files/7089e8ae-74f0-4736-8a38-dc0939110eaa/list_of_topics_for_paragraph_writing_for_grade_5.pdf
    • https://uploads.strikinglycdn.com/files/4424809d-5adb-46d3-bebe-ce2d66f6b828/64223559811.pdf
    • https://s3.amazonaws.com/xakapudakadu/mathematical_modeling_and_computer_simulation.pdf
    • https://s3.amazonaws.com/kujesulad/chemical_reaction_equations_introduction_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/3cbef111-3e00-4a24-9ae7-c914f62f1615/87658620220.pdf
    • http://mifijikamipupu.epizy.com/cannot_connect_to_certain_wifi_android.pdf
    • http://pejonoma.epizy.com/2268108946.pdf
    • https://s3.amazonaws.com/vunizi/ge_cafe_gas_range_reviews.pdf
    • https://s3.amazonaws.com/mamukawaxatali/cutest_anime_wallpapers_for_android.pdf
    • https://uploads.strikinglycdn.com/files/53440abd-408a-4770-9e67-0edf98e897cd/91419552304.pdf
    • https://uploads.strikinglycdn.com/files/c2551405-2538-4fcf-aeae-addfed447d02/flight_sim_x_steam_edition_review.pdf
    • https://uploads.strikinglycdn.com/files/4ad52d01-6069-491c-b0d8-b862a89c338f/how_to_clean_samsung_microwave_filter_model_me18h704sfs.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e844.bin
0a5c00e80d72f6849edae2a650c25d21d5cfdaf2977750b4f5d3005ca81d80d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 5472 bytes
font_01_sfnt_off0000facf.bin
cb8cd228d21be56282dc80eee060a8e7ca19fee8b8828f7f98e268e5273e160b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 10756 bytes

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