Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2d5a00b9fe9816…

MALICIOUS

PDF

75.4 KB Created: 2021-04-03 16:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 643220bbc9ba6c88ed7e414fa0753f80 SHA-1: 68da78f9314d6b4f1bdbb22bb7a6d423db12d117 SHA-256: aa2d5a00b9fe981678dbfcadaeeb04399b0651b6fff05f1a03482bce03aa3a35
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'dugedepap.ru'. This URL, combined with the heuristic 'PDF_SEO_LINK_FARM', suggests a tactic to generate traffic or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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-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://dugedepap.ru/award?keyword=city+of+atlanta+zoning+map+pdf
    • https://makezuxakoje.weebly.com/uploads/1/3/0/7/130739015/5495252.pdf
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/5170942.pdf
    • https://nalatuzub.weebly.com/uploads/1/3/4/3/134324595/korowosiso-sekisot-vuwasalira.pdf
    • https://pudakivofuleges.weebly.com/uploads/1/3/4/8/134853743/9f7aa9f5574ccaa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuvovoxigumuz/nitekefosixorodatalewofen.pdf
    • https://s3.amazonaws.com/roxawo/66017810372.pdf
    • https://s3.amazonaws.com/vososasoxumete/fewur.pdf
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_4790b0c149924567b78cda1e11810044.pdf?index=true
    • https://s3.amazonaws.com/rotowan/vijefozukasemarale.pdf
    • https://s3.amazonaws.com/sugosubexez/60356414731.pdf
    • https://s3.amazonaws.com/bagokiko/is_evening_primrose_oil_capsules_good_for_skin.pdf
    • https://s3.amazonaws.com/dexodekelaseki/civ_v_byzantium_guide.pdf
    • https://s3.amazonaws.com/gimisorixosu/zidezejoduzomoxuvim.pdf
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_eb3ba2a030fb4b7e92c6c6a8d0c19f5b.pdf?index=true
    • https://s3.amazonaws.com/supefujoxopubu/33684163482.pdf
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_1bf67940a91d4d1f8273c8a080c96708.pdf?index=true
    • https://s3.amazonaws.com/bifamomove/acute_bronchitis_2018.pdf
    • https://s3.amazonaws.com/bejenosugede/bangla_to_english_translation_apps.pdf
    • https://s3.amazonaws.com/xoferuzu/child_care_subsidy_application_form.pdf
    • https://s3.amazonaws.com/baxegezivumi/lista_de_verbos_irregulares_en_ingles_traducidos_al_espaol.pdf
    • https://s3.amazonaws.com/wupiwupiwot/54641714977.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_off0000e8e8.bin
956d73cc977036d56d95715774b8b734e05c7b515aafb3596f4dd92fecc173a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 5144 bytes
font_01_sfnt_off0000fa70.bin
7e33f1c98527fc6856e0f0e782d112e6ce08b65c57f3e0195a0742df0552104b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 11200 bytes

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