Malicious PDF — malware analysis report

Static analysis result for SHA-256 1239ffa33ae2e0ed…

MALICIOUS

PDF

100.9 KB Created: 2021-03-07 06:35:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0747921880e504324e6083b854e2dc6 SHA-1: b25a650d8aa3be41657d940b65a430921a27295d SHA-256: 1239ffa33ae2e0eda8d9ae3bc3464f23b368ef3f25011a153c900fa89f280b71
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, flagged as a PDF_SEO_LINK_FARM heuristic, with one primary malicious URL identified. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a link-based attack. No scripts were extracted, but the presence of numerous URLs suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://resalured.ru/strik?utm_term=brene+brown+book+2020
    • http://xusakarezexalu.iblogger.org/fobapusi.pdf
    • https://cdn.sqhk.co/josipinu/cwSq6RP/electric_guitar_parts_for_sale.pdf
    • https://cdn.sqhk.co/jamasedese/4hbb1lL/the_inner_world_xbox_one_review.pdf
    • https://cdn.sqhk.co/reparepoki/3jbnGha/flash_game_player_new_4._1.pdf
    • http://mafaregasinuviv.22web.org/aquaculture_science_book.pdf
    • http://sizegivip.22web.org/19266536799.pdf
    • http://xujadisilizaw.iblogger.org/how_to_port_your_mobile_number_online.pdf
    • https://cdn.sqhk.co/mitugejaxel/iapHVhf/phoenix_airport_food_terminal_c.pdf
    • https://cdn.sqhk.co/kukisigafumi/iehcZc9/music_audio_mp3_player_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_693cf82ba5334528b0ed2a6e5c0734a7.pdf?index=true
    • http://kitomov.epizy.com/whirlpool_washer_will_not_spin_out.pdf
    • https://uploads.strikinglycdn.com/files/4438257e-7140-4f66-9275-b7b4728529a7/dd_3.5_cleric_guide.pdf
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_0db47170b5e94d4994bf42bb79ca8536.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5012817f-e199-465d-88b4-023a534f4c6d/panasonic_bq_cc16_indicator_lights_blinking.pdf
    • http://jikirukuda.rf.gd/elements_of_petroleum_geology_selley.pdf
    • https://uploads.strikinglycdn.com/files/0e660e14-17f0-4559-9ed3-f37c0931da44/maytag_bravos_xl_diagnostic_mode.pdf
    • https://uploads.strikinglycdn.com/files/d20656a5-7eda-4d0c-88c9-65721384e4a1/32171256532.pdf
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_9b680a471232440196b22350b339a1ac.pdf?index=true
    • http://zunebafovako.epizy.com/zedepesitirebox.pdf
    • https://uploads.strikinglycdn.com/files/2fceab10-95c5-44ae-8209-05bdf737b6da/71797484088.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_off000140e6.bin
3fafcfb9b14d3454b736c5974c2c5213333449292672defef426959efa90069f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140E6 4540 bytes
font_01_sfnt_off00015062.bin
1205f362e6d71f537e8e73fa6b09e7c68df11114ae720a4a60e642ddb4f9b98d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15062 11336 bytes
font_02_sfnt_off000176d0.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x176D0 4324 bytes

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