Malicious PDF — malware analysis report

Static analysis result for SHA-256 83faaec86a1911be…

MALICIOUS

PDF

88.9 KB Created: 2021-04-03 06:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b409adb1c0d053f984299dc96708c87d SHA-1: 7dba2b431625fb8ef24e3f952e13471908adc66e SHA-256: 83faaec86a1911be339f972f27e553d68dc547e48043e7ce1751ab01be3d18b7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/award?keyword=antonio+jose+de+sucre+biografia+pdf
    • https://vilawamilufulob.weebly.com/uploads/1/3/6/0/136006615/6584615.pdf
    • https://cdn.sqhk.co/votojuxosaf/iggjUcT/logo_quiz_level_207.pdf
    • https://cdn.sqhk.co/baluwofuk/3idjcgc/video_maker_with_pictures_and_music_app.pdf
    • https://cdn.sqhk.co/xotakuzazuf/aheMUid/steven_universe_warp_tour.pdf
    • https://jimepozuzaz.weebly.com/uploads/1/3/5/3/135350414/foduni_dodigura_suvanapijewalix_kujevunix.pdf
    • https://nunodovov.weebly.com/uploads/1/3/1/3/131380210/jivilik_lefugakoboriwew.pdf
    • https://cdn.sqhk.co/zisazege/hfNZyid/maintenance_checklist_template_free.pdf
    • https://cdn.sqhk.co/lenufetimop/5niiiS3/13317130333.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/guwutivupudutu/ttulos_de_crdito_concepto.pdf
    • https://s3.amazonaws.com/vukusa/opie_heart_physiology.pdf
    • https://s3.amazonaws.com/xujitezu/employment_contract_variation_template_australia.pdf
    • https://s3.amazonaws.com/jopomodilamego/is_pokemon_yellow_the_same_as_red_and_blue.pdf
    • https://uploads.strikinglycdn.com/files/0551117c-115e-4a59-b23f-58ad45937584/what_is_the_default_username_and_password_for_netgear_wifi_extender.pdf
    • https://uploads.strikinglycdn.com/files/b16016c9-18a3-4123-9693-138a545f7aef/formato_de_nomina_sencillo.pdf
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_327f44c842794e229d3afc9c7798790e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/86830660-f132-48d3-8865-d87eb45c7a87/saribubomodumadibijuvemuj.pdf
    • https://s3.amazonaws.com/tobito/26860304848.pdf
    • https://uploads.strikinglycdn.com/files/1dc6223d-8557-46de-867e-3099f61d2bf0/how_to_eat_keto_at_el_pollo_loco.pdf
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_21e23daef6824ee8b5ad0fb851d700f5.pdf?index=true
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_14bec9f0b88c45d997cc48c7f82807e1.pdf?index=true
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_094dfa9ad5544c379c90ffd85929276b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/92682e16-6623-4abd-826c-0a434028d7e6/82185462796.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_off00010c4c.bin
df1fd187dc096af41e4afb02c9a5d3930a36a7542f9d683d4704e91384bf8cb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 5376 bytes
font_01_sfnt_off00011ea1.bin
435ad59b9138dea7b0aed6ca63b495f3c95f363ebf7bbb305aea1697fa1c54f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA1 12000 bytes
font_02_sfnt_off000145ef.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145EF 4324 bytes

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