Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7339a0caeff57e9…

MALICIOUS

PDF

79.5 KB Created: 2021-04-08 09:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 87a9f3bcab29774a63fd667448364877 SHA-1: ef57e51f7950774141208cf3bd15f47b20c888a6 SHA-256: e7339a0caeff57e949537379170b8ad775d35fe403fe5658cd4858a2e4c3f016
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to sheet music, suggesting a lure to disguise the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=thousand+miles+sheet+music+pdf In PDF document text
    • http://newipufisatag.scienceontheweb.net/zezugiva.pdfIn PDF document text
    • https://cdn.sqhk.co/pamezuravuno/eAEAH44/monster_truck_crot_monster_truck_racing_car_games.pdfIn PDF document text
    • http://kuliwegi.sportsontheweb.net/kowoduzivu.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/if8Rdij/intersection_controller_game_cheat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53e22df-eccc-4f58-b767-fb83173d4585/pemobagujirebo.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/berkshire_hathaway_annual_letter_to_shareholders_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/41347060393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/353ae2af-32d6-48b1-a6b4-70e89ec9d84d/jumpsuit_wedding_dress.pdfIn PDF document text
    • http://pozobigeva.rf.gd/achievers_b1_student_s_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ede2020-cd10-4ad5-8fe6-08538527677f/what_are_the_four_theories_of_prejudice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9203bfc7-ac46-4b0a-a020-40c39b165e44/muay_thai_basic_defense_techniques.pdfIn PDF document text
    • http://lonesopuw.onlinewebshop.net/anita_desai_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a257c3b6-23d0-485f-9b4d-3d4602cd04d7/epson_3020_projector_lamp_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/737720b5-4d05-405f-8ac9-451803232fe8/chekhov_best_short_stories.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/wutawu.pdfIn PDF document text
    • http://ketaxijos.rf.gd/what_child_is_this_christmas_song_lyrics_and_chords.pdfIn PDF document text
    • http://kegaregajisojas.rf.gd/after_action_review_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/microsoft_project_2013_free_download_for_windows_10_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad412322-dd22-4b79-a6a9-d1769b518a22/58852682348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a79e6855-60f8-405f-8690-0ca9b6066470/somewhere_over_the_rainbow_ukulele_chords_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490b55f1-bba3-47b5-abf1-44c003b6d865/what_is_the_book_diary_of_a_wimpy_kid_the_ugly_truth_about.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 5248 bytes
SHA-256: 1eed074a845652582f62560842a7f241bca58c3cce33bb4e72f535a9cec978e3
font_01_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 10756 bytes
SHA-256: 70f0fe3091518758339ff4ea3287e1f1d6569a19a190a3e4847d715082ac810b