Malicious PDF — malware analysis report

Static analysis result for SHA-256 06bc9bda35cb56e9…

MALICIOUS

PDF

96.7 KB Created: 2021-05-09 21:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9cc24ba6b1dfecf007302618cd140d58 SHA-1: 99a53292b4d17a3b1a293ef41c833886e9be1e3d SHA-256: 06bc9bda35cb56e9f1e20480a394a36c6c9b75ae35db31a047c1e25ea6c64d25
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and appears to contain junk data, but the presence of embedded URLs and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=where+the+wild+things+are+movie+explained+reddit PDF link annotation
    • https://cdn.sqhk.co/resozasevej/cZTFha3/24336407009.pdfIn PDF document text
    • https://cdn.sqhk.co/deliwewofok/Yig4rgl/goodnight_voice_random_match_chat.pdfIn PDF document text
    • http://nemekarasika.iblogger.org/oracle_sql_queries_examples_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/jazumagefo/b0uLijv/excel_footer_across_all_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/02Aijij/jumia_black_friday_smartphones.pdfIn PDF document text
    • https://cdn.sqhk.co/razilipot/ifieeTm/kulefigorikopok.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/3ia1zjg/32146206288.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/IjfZ5gj/zurigexewoxewedemola.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
    • https://uploads.strikinglycdn.com/files/92b8053c-ac94-475c-b616-e5ecfc69f62e/how_do_i_turn_on_subtitles_on_my_samsung_remote.pdfIn PDF document text
    • http://zolatororulukod.epizy.com/utopia_origin_guide_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16599b62-dfff-49e5-9cb8-f9b5ada95a79/62240308554.pdfIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_b91abe8bb7c345a78af88b4e82249da1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57489763-4254-474f-9d23-f71431418710/veterinary_pathology_book_ganti_sastry_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d491240-db71-4e7a-ba23-d5d22bf47ca9/what_is_zmodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/849cfa2f-70dc-4da2-a8d0-4fe2dd4d0c73/piguj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59518e1a-80f7-41c6-8e01-139c766191f0/73879070389.pdfIn PDF document text
    • http://dukiduzafenej.epizy.com/29603888917.pdfIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_e85412cff9ac4c8692fc085faea720b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/490473de-fc61-4c9f-b2b8-34f017239c96/53968382405.pdfIn PDF document text
    • http://kegonen.rf.gd/latest_movies_mp4_hd.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_off00012da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA8 5396 bytes
SHA-256: dc4767abd5860f5b357d0a727b9bd9f1c2ac2ce75b585942fb581b5f049ebb97
font_01_sfnt_off00013fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEC 11404 bytes
SHA-256: 311942342cf2d65d38f54db9d3475ddaa1cc9d79525b6324da09be00f23cb51e
font_02_sfnt_off0001667f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1667F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361