Malicious PDF — malware analysis report

Static analysis result for SHA-256 8039a57caa1ccbe9…

MALICIOUS

PDF

77.5 KB Created: 2021-03-14 02:14:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acb6c7ed938014c3d2c47b1fbf7e93a5 SHA-1: c243ae8680c9f6aed02a7c5455303f2f028b688c SHA-256: 8039a57caa1ccbe9c6e355a2894b3ac19d6ab284e00fd994b5189e4efd3ad204
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The presence of embedded JavaScript, though not fully analyzed here, suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=biology+science+for+life+4th+edition+pdf
    • http://d-youtube.com/avengers_main_theme_sheet_music_piano2ep5p.pdf
    • http://future-techno.ru/how_to_turn_off_demo_mode_in_sony_bravia_led_tv_without_remotejmrxq.pdf
    • http://obzorov.site/wopifudoraxupk48u2.pdf
    • http://kiwenalod.medianewsonline.com/89116123665.pdf
    • http://vawabipoxe.sportsontheweb.net/diagnosis_asma_pada_anak.pdf
    • http://sigixexizo.sportsontheweb.net/70590123223.pdf
    • http://pinerapidsrr.com/39962341671cdrpb.pdf
    • http://bovibuvebus.getenjoyment.net/exploding_kittens_card_game.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_d9857539bb184bbaa086d8862faf5f7e.pdf?index=true
    • http://xekazaz.myartsonline.com/15441212232.pdf
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_8ead504ede7241f59819d756ab8d4e9e.pdf?index=true
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_8a157905697b47d3b4a4c37d60364a89.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7929db26-aef4-456a-b1f3-88d508c46832/is_girl_interrupted_on_netflix_canada.pdf
    • http://xobibaga.myartsonline.com/nimisenukaju.pdf
    • http://lawaxisagiwog.atwebpages.com/articulos_sobre_el_cancer_de_mama.pdf
    • https://uploads.strikinglycdn.com/files/df030cd4-5a02-4bda-b62f-670c139ea4fb/58761971011.pdf
    • https://uploads.strikinglycdn.com/files/9e881e83-4183-438f-a34e-7d57ec106162/22447068394.pdf
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_f07cd0d4bf924e028a68a4bff5e4188c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aaf1076e-5d4a-4156-b10a-f1d923a09ce7/40204432646.pdf
    • https://uploads.strikinglycdn.com/files/4d14f372-5e50-46fe-afd6-e4ac8176522f/what_type_of_oil_does_a_craftsman_snowblower_take.pdf
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_869fb5321248450d9f7cc5afd6d5118d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/48e79251-4a18-4365-8c09-ebf482b254ff/15831107609.pdf
    • https://uploads.strikinglycdn.com/files/3d68253c-d621-402f-948c-41e61aabc192/critique_of_everyday_life_wikipedia.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03c.bin
34d9359bbcf58d9cbbe4fded69ce7ce9ebf7f0ad83dce012533579ab408bbc1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 5444 bytes
font_01_sfnt_off000102db.bin
9b4e9858e13e723aa8c515acd102ee3008f61d4330c5016bb1093ee196f04ea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 10984 bytes

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