Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a83c660207f2f9…

MALICIOUS

PDF

82.8 KB Created: 2021-03-23 19:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04bf918b122411a0039a184b0062f41f SHA-1: e9b44148cceedc362aa3d3ff27649729b8399d89 SHA-256: e0a83c660207f2f9fa402a63c64320ebfdf7a074fda783f1f1202ed9d66af8dc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by an ML classifier and contains a large number of external links, indicative of an SEO poisoning or link farm attack. The document body, though heavily obfuscated, suggests a lure related to academic content. The primary IOCs are the external URLs embedded within the document, which likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 4

  • 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.
  • 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://druttle.ru/award?keyword=bases+nitrogenadas+del+arn+pdf
    • http://caterm.ru/troy_bilt_horse_cultivator_attachmentqh0h9.pdf
    • http://gonalotuturopil.mywebcommunity.org/jifonopodolusuzetaz.pdf
    • http://dasiwujupuna.sportsontheweb.net/phonics_books_for_grade_2.pdf
    • http://oneitshop.info/dekivoxawa9xe1c.pdf
    • http://reactivaperu-2020.com/pewovovalukitqzf4d.pdf
    • http://amaryllis.space/how_much_is_a_round_bale_of_hay_worth_in_ontariom90sz.pdf
    • http://health-top.ru/android_phone_under_20000_in_nepalu830d.pdf
    • http://dalnoboyi.xyz/22379992900ev3ut.pdf
    • https://nufirejibojo.weebly.com/uploads/1/3/4/6/134645492/4090856.pdf
    • http://lifolibi.sportsontheweb.net/product_positioning_strategy.pdf
    • http://edapog.online/willy_wonka_musical_script1gr1v.pdf
    • https://fumabufoduf.weebly.com/uploads/1/3/5/3/135313851/binajuwe.pdf
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/nuxuk.pdf
    • http://gsmall.space/614627557279glo2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/69d187c9-f8cd-47f0-bfeb-dac3a0b7e972/98606099803.pdf
    • https://uploads.strikinglycdn.com/files/c9b2aadb-4247-41b5-98cd-a71b449b00c1/how_to_be_a_successful_public_relations_officer.pdf
    • https://uploads.strikinglycdn.com/files/8a66318b-2dbd-4dee-b58f-18e7003a9b57/wibipulukojok.pdf
    • https://uploads.strikinglycdn.com/files/3c89cff9-d11e-49d9-9a5d-26bc900ca574/went_down_the_rabbit_hole_meaning.pdf
    • https://uploads.strikinglycdn.com/files/bf85b706-7063-4d5b-bd7e-5528b3a470ce/english_book_grade_10_module_4.pdf
    • https://uploads.strikinglycdn.com/files/890b5dc6-29fe-4617-aa41-7097e388271f/kigixaxotutaragoroli.pdf
    • http://mikijanux.atwebpages.com/marathi_barakhadi_file.pdf
    • http://malejubu.myartsonline.com/adhoc_sensor_networks_notes.pdf
    • https://uploads.strikinglycdn.com/files/296c3f4c-eed4-45f3-a61f-828559b69384/how_to_keep_him_wanting_you.pdf
    • https://uploads.strikinglycdn.com/files/650d4839-627e-47cf-9a6a-f032fd8316df/42914917603.pdf
    • https://uploads.strikinglycdn.com/files/3be04bf5-f002-4ecc-8bba-decf94214e21/100_g_harina_en_tazas.pdf
    • https://uploads.strikinglycdn.com/files/932affb1-23f9-4da5-b4a1-17ba0f450de7/potedukerozafu.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_off0000f2eb.bin
6cf1fd363a7ac8a639c468d2145aeda62407881f0135ff0c937f87a88375a332		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 5260 bytes
font_01_sfnt_off000104dc.bin
e4bda6c230ab480a1e6f959cd1dec58b47f9b961505458f0e2cfc54531255c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 12092 bytes
font_02_sfnt_off00012c9e.bin
d6f11b66fb63ccd168794cc7bf73a214e8574ce95664766f1b898bbcf23688c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9E 4260 bytes

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