Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac99bdcc54a1f025…

MALICIOUS

PDF

83.3 KB Created: 2021-03-08 19:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04628b480942fd3306adab11afc788d2 SHA-1: 1674e9bb4f131445b323bde32da880207e8b7164 SHA-256: ac99bdcc54a1f025927733ee80361a13039a9dbfa733b2e30fb62865324954a7
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' pointing to 'http://idealica-columbia.site/dizekiwibavoj8daq8.pdf'. Another embedded URI leads to 'https://seumenha.ru/strik?utm_term=a+christmas+carol+short+version+esl'. The document body is heavily obfuscated, but the presence of these links suggests an attempt to redirect the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/strik?utm_term=a+christmas+carol+short+version+esl
    • http://idealica-columbia.site/dizekiwibavoj8daq8.pdf
    • https://jugotogosef.weebly.com/uploads/1/3/0/8/130814460/5878528.pdf
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/592fdfa7d4d789a.pdf
    • https://sugelazo.weebly.com/uploads/1/3/4/7/134767002/laxirikulirafedabuf.pdf
    • http://cheapestshop.xyz/what_is_the_most_popular_winter_sport_in_canadac7rbn.pdf
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/digosi.pdf
    • http://raisinshub.pro/roderutemokevotubufqbnwz.pdf
    • http://fepotarugagi.22web.org/renixogarum.pdf
    • https://nulenedo.weebly.com/uploads/1/3/6/0/136084055/lositamefabija_lisuzekozopalo_zewexi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b34841c7-feba-470b-a683-393a0fd5bf86/7034798733.pdf
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_ef8de87ef00147799d2e22256e5aa508.pdf?index=true
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_88b7a3a3e1b04877b82ca14de4ad5298.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b1b98669-4812-4c2c-b70c-4ad722cc0b25/the_bronze_bow_chapter_17_summary.pdf
    • http://kesajuwigiferu.epizy.com/haryana_arkestra_video.pdf
    • http://fivosuregimafeb.rf.gd/felices_das_to_sergio_summary.pdf
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_a899f4e1c67048a6b35a38d1b0868dcd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/85d38100-790e-4e80-9245-d441f31c8e12/zufejadet.pdf
    • https://uploads.strikinglycdn.com/files/f8e738b2-42e7-4620-8b41-700fd689023e/womepupelabenakuwu.pdf
    • https://uploads.strikinglycdn.com/files/0b52d5ef-0099-40c2-8bce-dae087a8e1bf/ligavevin.pdf
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_332b447310e74a309d0b736a2e2e636a.pdf?index=true
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_46ea355b6810405bbbe9fbab1be3f9b9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a90273b-cfaf-4bfa-9f69-230c61d7fe17/best_book_to_improve_english_vocabulary_free_download.pdf
    • https://uploads.strikinglycdn.com/files/d9e24d96-5424-46f5-bc0a-15a83edfde38/constitucion_de_venezuela_del_ao_1961.pdf
    • https://uploads.strikinglycdn.com/files/9e078dc6-b29c-4dd0-9c7f-ef44de953382/demoluvonisixelugej.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_off0000fda0.bin
8c6337c16e68293efda5464724c2839d694f0e0ff0614cb6e6c6d12f19d77656		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 4876 bytes
font_01_sfnt_off00010dff.bin
b308d4b21dcaf5966ea8774588402771d724c581bcd7ce390b9d690bc1be4a4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 10472 bytes
font_02_sfnt_off000131a6.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131A6 4324 bytes

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