Malicious PDF — malware analysis report

Static analysis result for SHA-256 c038467dfc4a2b9b…

MALICIOUS

PDF

77.9 KB Created: 2021-04-01 17:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d9ca6efbc3cfa2cf6110e0f46997525d SHA-1: 68eaee2043e36a95f11d5b8ff10e671deabbff41 SHA-256: c038467dfc4a2b9b3d8e4003a58a263c95dbc547f1fbc68ff479a39a1daca7ad
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to disguise malicious content within a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://golowaki.ru/award?keyword=conducta+antisocial+definicion+pdf PDF link annotation
    • https://cdn.sqhk.co/ripalufix/1U1jbi5/gokeso.pdfIn PDF document text
    • http://im-marceting.site/rabajekedagiwawuwabogoimizn.pdfIn PDF document text
    • http://golitibixodeku.iblogger.org/75153469149.pdfIn PDF document text
    • http://dhl-order.info/31666252187idzuw.pdfIn PDF document text
    • http://timelessdecorum.com/chupana_bhi_nahi_aata_ringtone_freey2wuk.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/Vhgjhid/hello_telugu_movie_ringtone_songs_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gowalitusiwa/fTWjjgf/29088955340.pdfIn PDF document text
    • https://cdn.sqhk.co/nefijisob/7EgdjiG/vex_2_yepi_unblocked.pdfIn PDF document text
    • http://zabekoreju.iblogger.org/kiran_publication_bank_po_maths_books_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/ughOiaE/50612258023.pdfIn PDF document text
    • https://cdn.sqhk.co/mixasuwekov/iehh9cK/28472695061.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/hihhGij/mens_haircuts_2019_short_fade.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/Eididha/download_goons._io_knight_warriors_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/cjdCghk/93116708854.pdfIn PDF document text
    • http://zujewap.mygamesonline.org/ballade_pour_adeline_piano_score.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwutu/ggjihgh/modern_wood_tv_stand_design.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/divikufifir/63757161859.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/cbse_1st_grade_math_worksheets.pdfIn PDF document text
    • http://gaditimotef.rf.gd/column_chromatography_adsorption_and_partition.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/zifunexinujeweperol.pdfIn PDF document text
    • http://zalatikewal.atwebpages.com/adriana_figueiredo_livro.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/1866268043.pdfIn PDF document text
    • http://jefelaxe.epizy.com/how_to_block_calls_on_cordless_phone.pdfIn PDF document text
    • http://pigozezidum.rf.gd/balanced_scorecard_measures.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_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 4960 bytes
SHA-256: 69c1fdcaa47175faf42658e611c34b1a22de2c5d6a92a965af78944927b5eabd
font_01_sfnt_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 12368 bytes
SHA-256: 50ce8eda58a1ba2080a984232d7bc32888c144b90f32a87ced521fe5991c9430

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