Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9214ff9f5596c7d…

MALICIOUS

PDF

84.7 KB Created: 2021-03-18 04:08:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f941a165571a77e80d7778f10a3d1e3f SHA-1: 51a7a744002b93b62ae9eb2f24a3d7f748a970d1 SHA-256: a9214ff9f5596c7d2334d13e1de5027e9ad6f988d0b3335546f854db474f205c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign. The document body, though heavily obfuscated, contains references to 'beautify excel spreadsheet' and 'wkhtmltopdf', hinting at a lure to disguise malicious activity. The presence of numerous external URLs, including one pointing to 'dafemum.ru', strongly suggests the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=beautify+excel+spreadsheet
    • https://cdn-cms.f-static.net/uploads/4465908/normal_604d13fddd22a.pdf
    • https://cdn.sqhk.co/devisofage/1ZkIxjb/alienware_laptop_battery_price.pdf
    • https://cdn.sqhk.co/gemesikexo/ghaghgh/ludo_online_multiplayer_6_players.pdf
    • https://cdn.sqhk.co/gujurolekuma/TWzRhfT/parupagetegaxobesoweni.pdf
    • https://cdn.sqhk.co/xederebat/aNifhgU/turn_off_data_roaming_iphone_8.pdf
    • https://cdn.sqhk.co/wetilusogaki/gDZCNhb/download_game_gladiator_glory_mod_apk.pdf
    • https://cdn.sqhk.co/xonipavu/okFOUhe/stickman_full_destruction_stickman_run_3.pdf
    • https://cdn.sqhk.co/bapisolel/hahbidI/lada_2107_tuning_salon.pdf
    • https://cdn.sqhk.co/lasotepana/gi0icsw/go_kart_buggy_racing.pdf
    • https://cdn-cms.f-static.net/uploads/4413564/normal_5fe68b43df6fc.pdf
    • https://cdn.sqhk.co/wozejodes/DgXjiji/99536087839.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://megigezorozo.atwebpages.com/how_to_get_a_direct_deposit_form_rbc.pdf
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_6d9d0ef04b48472caa4c9e30ddf0c15a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/37ae0f55-8803-4124-a416-9d55dcd52a13/60053672726.pdf
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_24bfb4f50c7c42b2bfa109424bf7b036.pdf?index=true
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_f64801cae31545538f2d3af879bae589.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6cb4f1f6-297f-445c-b100-72435ed62316/flow_chart_proof.pdf
    • https://uploads.strikinglycdn.com/files/d3838a48-4b70-427f-a882-f39c1cebfd06/second_ashra_dua_in_english.pdf
    • https://uploads.strikinglycdn.com/files/feb7e3a4-d66b-4fe0-8b82-14984fe5491a/bergson_time_and_free_will.pdf
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_fdce5afcb1644d7fb42820b0fcf2229d.pdf?index=true
    • http://bugenerefajujus.atwebpages.com/does_honda_make_pressure_washers.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_off00010165.bin
6bb2d787270e804d9056f9e0300742b25d99b4170bb24595eab6fa3ee938707a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 5128 bytes
font_01_sfnt_off000112fa.bin
2086c8f9eac6d62c5cbb67d87802c03c60065397877083abf947a82ea02d22ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 10652 bytes
font_02_sfnt_off00013771.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13771 4324 bytes

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