Malicious PDF — malware analysis report

Static analysis result for SHA-256 faff2bf065da48d8…

MALICIOUS

PDF

85.2 KB Created: 2021-06-06 20:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66903dc3c3cc6c50aff6fa88300d6e28 SHA-1: 214f91caebf025d0149ef14620b5e645d7b701f1 SHA-256: faff2bf065da48d857628c5d489a2adcc7bf3cbca912350a5b162ccc58b25487
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 partially garbled, contains text related to 'declaration letter for college', suggesting a lure. An external URI, https://synerhu.ru/pbw?utm_term=how+to+write+a+declaration+letter+for+college, was extracted, which is likely the primary objective of this document, potentially leading to a phishing site or further malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/pbw?utm_term=how+to+write+a+declaration+letter+for+college
    • https://cdn-cms.f-static.net/uploads/4470027/normal_6069ffd35d327.pdf
    • https://static.s123-cdn-static-d.com/uploads/4368977/normal_60b45a927a5c6.pdf
    • https://static.s123-cdn-static-d.com/uploads/4475570/normal_60b78f47aaf5c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kevuxezedila.pbworks.com/f/fountas_and_pinnell_level_n_chapter_books.pdf
    • http://sofutikajen.pbworks.com/w/file/fetch/144456048/vazipajudoj.pdf
    • http://rujuboxu.pbworks.com/f/cacfp_site_monitoring_form.pdf
    • https://uploads.strikinglycdn.com/files/8fb88218-2fab-40b7-b950-2996069ab112/acs_organic_chemistry_2_exam.pdf
    • https://uploads.strikinglycdn.com/files/7ab60b8e-3038-418d-a5b8-ac36379ec989/como_nao_morrer_livro.pdf
    • http://wiwedano.pbworks.com/f/13054853981.pdf
    • https://uploads.strikinglycdn.com/files/5bc6deeb-916d-45ab-a448-8290ff181015/what_are_the_first_20_elements_and_their_symbols.pdf
    • http://mejigulo.pbworks.com/f/50788964440.pdf
    • https://uploads.strikinglycdn.com/files/5593057b-2bc1-4fd5-a463-da34d68cca8a/company_of_heroes_legacy_edition_steam.pdf
    • https://uploads.strikinglycdn.com/files/e7f90c7e-dc19-43be-99b0-e9d83f27482e/samsung_front_load_washer__dryer_set_with_steam_in_champagne.pdf
    • http://patimedudemu.pbworks.com/w/file/fetch/144676449/mubit.pdf
    • http://zezimin.pbworks.com/w/file/fetch/144422472/can_you_give_someone_a_3_day_eviction_notice.pdf
    • https://uploads.strikinglycdn.com/files/b2702052-0b88-462d-9c72-d721ca32c74f/is_swollen_hands_a_sign_of_labor.pdf
    • http://morabef.pbworks.com/w/file/fetch/144673476/94322114646.pdf
    • http://kigijujozi.pbworks.com/f/what_does_it_mean_when_red_light_flashes_on_panasonic_tv.pdf
    • http://gitefov.pbworks.com/w/file/fetch/144570180/ketogenic_diet_recipes_free.pdf
    • http://fevawigo.pbworks.com/f/sokofafusab.pdf
    • http://mudowomuxexo.pbworks.com/f/what_to_say_in_pip_mandatory_reconsideration_letter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010454.bin
9bf32a26c08b8fe59ebb3747e3d24521ff0eecf45f2b31d28d4a9bd86e1028bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 4852 bytes
font_01_sfnt_off000114ed.bin
29a596fcee32831be52134c86deefb8c936ba5e5252e614aac714214433d646c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 10560 bytes
font_02_sfnt_off000138d3.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138D3 4324 bytes

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