Malicious PDF — malware analysis report

Static analysis result for SHA-256 77adcd9430c59b28…

MALICIOUS

PDF

97.8 KB Created: 2021-03-26 02:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a1393794f96a4e9a94edaf35d3fb6f76 SHA-1: a924ef51b5db00c1566ed6eff3607c7424045894 SHA-256: 77adcd9430c59b289993912e1c4cf5ce3730ec052a954cf100da7fa4cc041e61
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the nature of link farms often involves JavaScript execution to redirect users or obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://soxebez.ru/award?keyword=la+magie+sacr%25C3%25A9e+ou+livre+d+abramelin+le+mage+pdf PDF link annotation
    • http://nukels.xyz/27227420602doutq.pdfIn PDF document text
    • http://sayfelengs.space/nuxatujamefoxafoeiavi.pdfIn PDF document text
    • http://kittyplay.online/badger_1_garbage_disposal_lowesffqk7.pdfIn PDF document text
    • https://cdn.sqhk.co/jogujufuza/fzgcBhd/employment_verification_letter_for_spouse_visa_template.pdfIn PDF document text
    • http://vk-settings-change.online/461066311137jx2q.pdfIn PDF document text
    • http://munupesifak.22web.org/zajumobodirezulokimi.pdfIn PDF document text
    • http://jnatural.space/bri_mobile_versi_lamavkkci.pdfIn PDF document text
    • http://appletopshop.ru/all_sat_practice_tests_reddit61re8.pdfIn PDF document text
    • https://cdn.sqhk.co/waxoxewanuvi/cHNA2lg/best_remixes_on_spotify.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/how_to_block_your_cell_number_from_caller_id034mp.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/b91f263f-aa31-49fe-b7a0-c8d8b60ebc5c/rovujovoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4101e143-4555-4799-bdb2-ed30c60ab0d6/four_seasons_worksheet_grade_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62953d43-3827-47f9-83d1-df8cfa6b9918/golden_song_thailand_season_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c174cd0a-78e1-4766-9bf3-6c4c9fb12ebe/foxiwakipuwum.pdfIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_db28d40c6d524cf0ac66e33fe15e6276.pdf?index=trueIn PDF document text
    • https://e8802323-0824-40c5-8a58-19d700e27586.filesusr.com/ugd/50cafd_9c361b2082f547be9f2af675ba692850.pdf?index=trueIn PDF document text
    • http://wepirizifomonij.epizy.com/88902072024.pdfIn PDF document text
    • http://zifofupox.rf.gd/63150437405.pdfIn PDF document text
    • http://lulevewutowa.epizy.com/samsung_galaxy_note_4_screen_size_inches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa2b36a-46d0-4f04-8625-5dee0c59ae8b/the_masque_of_the_red_death_1964_full_movie_youtube.pdfIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_b7a819bce822410e8b74ddfe0820690c.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 5756 bytes
SHA-256: a139a389deb292986f31816e0f28e3d74cf7a643cc159ec914dc8b378062a723
font_01_sfnt_off00012d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2B 17368 bytes
SHA-256: 9097694eb0dd62462cc6d3807a95f04677629e5208dc70171d2199371b165cf5
font_02_sfnt_off0001619b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1619B 16088 bytes
SHA-256: 7b61b80ad9eae8da687db589656cc14036b78b470666db3a00a61726a6371a4d